Abstract: A method of calculating a weight of a gemstone via an electronic device by selecting at least one gemstone characteristic from a list of predetermined gemstone characteristics wherein the device calculates a weight of a gemstone by processing the at least one gemstone characteristic within a gemstone weight algorithm and displays the resulting weight on the electronic device. The gemstone characteristics include a gemstone type, a gemstone shape, a gemstone outline, a gemstone girdle and a gemstone bulge. In addition, a user of the method enters a gemstone size into the electronic device. A user may select in which order he/she selects a gemstone characteristic or enters a gemstone weight and may navigate to and from each characteristic. Once the user selects the appropriate gemstone characteristics, a gemstone weight algorithm performs the appropriate calculations so as to determine the weight of the gemstone.

Abstract: Diamonds are marked by applying apertured stencils bearing identifying indicia to the girdles, applying a fusible coating material over the apertured stencils, and then heating the coating material to fuse the material on the girdles. The stencils can be eliminated, and the indicia can be formed by directing a source of radiant energy at the coating material, and by moving the source and/or the girdle relative to each other.

Abstract: A jewelry arrangement having a mounting, a main gemstone positioned in the mounting, and a plurality of secondary gemstone positioned in the mounting underneath the main gemstone. The main gemstone can have a crown with a table and a pavilion, wherein the table can be positioned adjacent and at a first distance from the plurality of secondary gemstones. The main gemstone can also have a plurality of side which converge toward each other and have a plurality of facets. The sides can coverage towards a top which can be a second distance from the secondary gemstones such that the first distance is less than the second distance. An optical illusion can be created by orienting a main gemstone above a first number of secondary gemstones and configuring the main gemstone so that when the secondary gemstones are viewed through the main gemstone, a second number of secondary gemstones is visible such that the second number is greater than the first number.

Abstract: The present invention provides a cut stone including a top surface and a bottom surface and a girdle. The top surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The bottom surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The girdle is disposed between the first facet row of the top surface and the first facet row of the bottom surface.

Abstract: A gemstone cut into a round stone and method of cutting a gemstone are disclosed herein. A crown having a table may be surrounded by eight star sets. The eight star sets may be surrounded by eight bezel facets. The eight bezel facets may be surrounded by eight pairs of upper girdle facet sets. Each upper girdle facet set may have one primary upper girdle facet and two secondary upper girdle facets. Each star set may have one primary star facet and four secondary star facets. A bottom having a culet may be surrounded by 8 pavilions the eight pavilions may be surrounded by 8 lower girdle facet sets. Each lower girdle facet set may have one primary lower girdle facet and two secondary lower girdle facets. Both the crown and bottom may be surrounded by 16 girdle facets or by perfectly circular girdle.

Abstract: An encrusted gemstone comprising a base diamond having a crown with a table surface, a pavilion, and a recessed seat in the table surface, an insert diamond having a pavilion matching said recessed seat and set therein, a bore extending axially between a culet of the base diamond and the recessed seat thereof, and a shaft received within said bore, said shaft having a proximal end projecting into the recessed seat and formed with an insert retaining portion, and a distal end projecting from the culet and provided with a securing arrangement.

Abstract: The invention provides a gemstone material having therein embedded a plurality of dichroic particles. Methods of producing the gemstone material are also provided. The gemstone material can be provided in the form of a slab, faceted gemstone, or cabochon.

Abstract: A method and an apparatus for laser marking indicia in the volume of gemstones such as diamonds, the indicia being made up of a plurality of microscopic dot-shaped marks whose build-up can be initiated by exposing naturally-occurring internal defects or impurities in the volume of a gemstone to a tightly focused train of laser pulses. Authentication data is encoded in the gemstone from the relative spatial arrangement of the dot-shaped marks that form the indicium. Taking advantage of the presence of otherwise invisible defects in the gemstone allows for inscribing indicia with laser pulses carrying energies substantially lower than the threshold energy required for inscribing in the volume of a perfect gemstone material. The marking process is then much less susceptible to inflict damages to the surface of the gemstone, and the marking can be performed using a broad variety of femtosecond laser systems.

Abstract: System and method for providing a gem assessment based upon proportional parameter values relating to the proportions of a gem, such as a diamond. A gem cut quality rating is provided. The system and method are particularly suited for use in an online environment or may be utilized in conjunction with rough diamond analysis instruments in order to provide cutters with greater guidance as to the most appropriate dimensions to cut rough diamonds in order to maximize the yield of a rough diamond and to also produce a diamond of an acceptable grade.

Abstract: A cut design of an ornamental diamond and an observation method of the diamond which an observer can perceive a more beauty, are disclosed. The cut design is a round brilliant cut comprising a girdle, a crown above the girdle and a pavilion below the girdle. A girdle height (h) is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) of a pavilion main facet ranges from 37.5 degrees to 41 degrees, and a crown angle (c) of a crown main facet is within a range of satisfying: c>?2.8667×p+134.233 and p<1/4×{(sin?1(1/n)+sin?1(1/n·sin c))×180/?+180·2c}, wherein n: refraction index of a diamond, ?: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees. The cut design of the ornamental diamond provides an observer with plenty of visual-perceptible reflection when the observer watches the diamond above a table facet with a sight line of an angle less than 20 degrees with a vertical line at the center of the table facet.

Abstract: A method of creating a diamond includes the steps of creating entry points and internal passages in a natural or synthetic diamond, infiltrating a mixture comprising ashes produced from living human and animal parts or deceased human or animal parts into the diamond, and crystallizing the mixture. The diamond may then be repolished or refacetted. The invention also includes diamonds having discrete internal portions comprising ashes made from living human and animal parts, which internal portion are substantially transparent and which have an index refraction substantially matching that of the diamond.

Abstract: Ten of pavilion main facets are formed with reference to the previously formed five of first pavilion main facets in which an initial first main facet is formed in a position centered on a line shifted approximately fifteen degrees from the ridge of the raw diamond on the pavilion side. Ten of pavilion main facets 19 radiate from the curette 18 and twenty of lower girdle facets are formed between the adjacent pavilion main facets on the pavilion side of the diamond 1.

Abstract: A brilliant gemstone cut, having a crown, a girdle and a pavilion. The crown has a flat table shaped as an equilateral n-sided polygon. The girdle is also multi sided polygon. The corner, lower girdle, bezel and star facets are at significantly angles of inclination, with respect to the table to provide significantly improved brilliance. The upper corner facets are spaced from the girdle. The space between the corner facet vertices and the girdle is left open to be covered by a prong of a jewelry setting.

Abstract: A cut design of an ornamental diamond and an observation method of the diamond which an observer can perceive a more beauty, are disclosed. The cut design is a round brilliant cut comprising a girdle, a crown above the girdle and a pavilion below the girdle. A girdle height (h) is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) of a pavilion main facet ranges from 37.5 degrees to 41 degrees, and a crown angle (c) of a crown main facet is within a range of satisfying: c>?2.8667×p+134.233 and p<¼×{(sin?1(1/n)+sin?1(1/n·sin c))×180/?+180?2c}, wherein n: refraction index of a diamond, ?: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees. The cut design of the ornamental diamond provides an observer with plenty of visual-perceptible reflection when the observer watches the diamond above a table facet with a sight line of an angle less than 20 degrees with a vertical line at the center of the table facet.

Abstract: A layer of single crystal boron doped diamond produced by CVD and having a total boron concentration which is uniform. The layer is formed from a single growth sector, or has a thickness exceeding 100 ?m, or has a volume exceeding 1 mm3, or a combination of such characteristics.

Abstract: A mixed cut gemstone comprising a girdle, a crown above the girdle and a pavilion below the girdle. The crown has a girdle break, a table break and a table. The table break is cut with triangular shaped facets and the girdle break is cut with triangular and quadrilaterally shaped facets. The present invention also describes a pavilion having a width and a length formed by two pairs of opposing pavilion sides and four pavilion corners. The pavilion is composed of four steps including: a first step descending from said girdle to a first step facet junction, a second step descending from said first step facet junction to a second step facet junction, a third step descending from said second step facet junction to a third step facet junction, and a fourth step descending from said third step facet junction to said culet. This mixed cut gemstone enables the appreciation of the desirable characteristics of a diamond in ways that prior art cuts do not allow.

Abstract: The invention provides a decorative object comprising a transparent or translucent substrate having a body and at least one surface bearing a thin film coating. The coating imparts in the substrate a body color that appears substantially constant at different angles of observation. This body color is imparted in the substrate at least in part by absorption of visible radiation that is transmitted through said coating. The coating includes a high absorption layer comprising film that is highly absorptive of visible radiation. Also provided are methods of coating gems and other decorative objects, as well as methods of heat treating coated gems and other decorative objects.

Abstract: This invention relates to diamond and more particularly to diamond produced by chemical vapour deposition (hereinafter referred to as CVD). According to a first aspect of the invention, there is provided a layer of single crystal CVD diamond of high quality having a thickness of at least 2 mm.

Abstract: A pearl including a nucleus optionally including a gem and a nacre coating. The nacre coating partially coats but does not fully coat the nucleus thereby exposing at least a portion of the nucleus.

Abstract: A microinscribed gemstone such as a diamond is inscribed by a laser beam to graphitize a surface portion of the gemstone without damaging a bulk portion.

Abstract: A gemstone having a crown, a girdle and a pavilion, wherein the girdle is shaped such that, when viewed in plan view, it is primarily bounded by four pairs of parallel straight edges. Three of the four pairs of edges are spaced by roughly equal spacing D1, while the remaining pair of edges is spaced by a spacing D2, wherein D2 is greater than D1 by between 10% and 40%. Also provided is a method for cutting such a gemstone.

Abstract: The invention provides a decorative object comprising a transparent or translucent substrate having a body and at least one surface bearing a thin film coating. The coating imparts in the substrate a body color that appears substantially constant at different angles of observation. This body color is imparted in the substrate at least in part by absorption of visible radiation that is transmitted through said coating. The coating includes a high absorption layer comprising film that is highly absorptive of visible radiation. Also provided are methods of coating gems and other decorative objects, as well as methods of heat treating coated gems and other decorative objects.

Abstract: A circular cut diamond, with appropriate dimensions, to greatly enhance the brilliancy, scintillation, and dispersion of a circular cut diamond and to produce a larger-looking diamond per unit volume as compared to the current standard Ideal Cut.

Abstract: The invention provides a setting for a precious stone comprising a support for a precious stone; contact means for establishing a contact between the support and a stone within the support; a detector for detecting a break in the contact; and an emitter for emitting a signal on detection of the break in the contact. The setting provides a means of alerting wearers of an item of jewellery that the precious stone is loose within its support.

Abstract: Disclosed is a diamond cutting method comprising the steps of: forming a square or rectangular table in a piece of gemstone; and forming a pavilion continuous to the table by cutting vertically from each side of the square or rectangular table to define the four lower-girdle facets and by cutting obliquely from each corner of the square or rectangular table to the culet of the pavilion to form four lower-main facets, whereby the upper opposite sides of each lower-main facet adjoining the adjacent lower-girdle facets whereas the lower opposite sides of each lower-main facet adjoining the confronting lower opposite sides of the adjacent lower-main facets. An enneahedral-cut diamond thus produced is a table-and-pavilion structure, permitting plural diamonds to be arranged side by side as a whole with their square or rectangular tables directed inward or outward.

Abstract: Disclosed is a diamond cutting method comprising the steps of: forming a square or rectangular table in a piece of gemstone; and forming a pavilion continuous to the table by cutting vertically from each side of the square or rectangular table to define the four lower-girdle facets and by cutting obliquely from each corner of the square or rectangular table to the culet of the pavilion to form four lower-main facets, whereby the upper opposite sides of each lower-main facet adjoining the adjacent lower-girdle facets whereas the lower opposite sides of each lower-main facet adjoining the confronting lower opposite sides of the adjacent lower-main facets. An enneahedral-cut diamond thus produced is a table-and-pavilion structure, permitting plural diamonds to be arranged side by side as a whole with their square or rectangular tables directed inward or outward.

Abstract: A method for producing a diamond includes forming a table lying in a table plane; forming crown facets that are oriented at an angle of between 26° and 35° relative to the table plane; forming upper pavilion (UP) facets below the crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottoms of the crown facets and tops of the UP facets; and forming a set of lower pavilion (LP) facets between bottoms of the UP facets and the culet at an angle of between 38° and 44° relative to the girdle plane. The UP and LP facets form a rib line positioned between one-fifth and four-fifths the distance between the girdle plane and the culet, such that the UP facets extend between 20% and 80% of the distance between the girdle plane and the culet.

Abstract: A gemstone arrangement is described including a primary gem and at least one complementary gem. The primary gem includes a crown and a pavilion. The pavilion has an external wall defining an outer surface. The complementary gem has a crown defining a table. The table is in juxtaposition to and aligned with the pavilion wall for the maximum passage of ambient light from the complementary gem into the primary gem to enhance its visual appearance. In addition, the complementary gem can be positioned and aligned to receive light losses from the primary gem and return those light losses through the crown of the complementary gem to the primary gem.

Abstract: A diamond is provided which is subjected to an improved rectangular brilliant-cut producing a facet configuration having an optimal shape for the purpose of increasing the visual-perceptible reflection ray amount. In the rectangular brilliant-cut diamond, the bezel facets at the four crown vertexes each is bent along the diagonal line parallel to the girdle, to yield the facet configuration in which the bezel facet is divided into the lower bezel facet and the upper bezel facet. The upper crown angle of an upper bezel facet can be made smaller than the crown angle of a lower bezel facet, and hence even without altering the crown height, by making the table facet slightly smaller, the tilt angles from the horizontal of the star facets and the second bezel facets, both provided with intense reflection, can be made small and the areas thereof can be made large.

Abstract: A novel gemstone cut comprising a crown, a girdle, and a pavilion, wherein the gemstone includes precious gemstones (such as diamonds) and semi-precious gemstones. The crown includes an octagonal table, which is surrounded by eight triangular star facets. Eight table bezels are disposed in-between the star facets and eight mid-bezels are disposed in-between the table bezels. Furthermore, the gemstone's pavilion has eight concentrically arranged culet pavilion facets, a girdle pavilion facet and a bottom small break facet that are disposed in-between the culet pavilion facets. The gemstone's girdle has eight left top half facets and eight right top half facets (located in-between the girdle bezels of the crown), and eight left bottom half facets and eight right bottom half facets (disposed in-between the girdle pavilion facets and bottom small break facets).

Abstract: A method, system, and article of manufacture for marking and identifying gemstones, mined materials or objects, precious metals, or other similar valuable materials by encasing selected gemstones within removable casing. Identifiers may be included within the casing or actually branded directly onto mined objects. The identifier may be a chemical composition of the casing, a tag, logo, or similar mark, or an encoded identifier such as a bar-code, matrix, or data glyph. Information within the identifiers provide different types of information including information relating to the origin, identify, chain of possession, and owner of the gemstone.

Abstract: A pearl including a nucleus optionally including a gem and a nacre coating. The nacre coating partially coats but does not fully coat the nucleus thereby exposing at least a portion of the nucleus. A method including inserting a nucleus into a mollusk able to produce a pearl, incubating the nucleus within the mollusk, and removing a portion of the nacre coating thereby exposing a portion of the nucleus.

Abstract: A princess cut gemstone having a pavilion, a girdle, and a crown. In the presently preferred embodiment, the princess cut gemstone is a diamond with 101 facets: a pavilion of 64 facets, a girdle of 4 facets, and a crown with 33 facets (including the table).

Abstract: The invention provides a decorative object comprising a transparent or translucent substrate having a body and at least one surface bearing a thin film coating. The coating imparts in the substrate a body color that appears substantially constant at different angles of observation. This body color is imparted in the substrate at least in part by absorption of visible radiation that is transmitted through said coating. The coating includes a high absorption layer comprising film that is highly absorptive of visible radiation. Also provided are methods of coating gems and other decorative objects, as well as methods of heat treating coated gems and other decorative objects.

Abstract: A circular cut diamond, with appropriate dimensions, to greatly enhance the brilliancy, scintillation, and dispersion of a circular cut diamond and to produce a larger-looking diamond per unit volume as compared to the current standard Ideal Cut.

Abstract: The present invention is directed to a brilliant diamond comprised a crown portion having a table facet, a plurality of upper main facets, star facets, and upper girdle facets. The upper girdle facets form upper girdle intersecting sides and upper main facet intersecting sides. A pavilion portion has a plurality of lower main facets and lower girdle facets, which are formed in a substantially aligned arrangement with the upper girdle facets. The lower girdle facets including a lower girdle intersecting side and a lower main facet intersecting side. A girdle surface is located in between the crown and the pavilion portions, where the profile of the girdle surface includes a wide portion at areas of intersection with the upper main facet intersecting sides and a narrow portion at areas of intersection with the upper girdle facet intersecting sides.

Abstract: A decorative stone made of glass is provided with a facetted front and a mirrored rear converging from the periphery of the stone to a point provided with an adhesive (10), wherein the angle between opposite surfaces of the rear of the stone (1) is more than 150°.

Abstract: A brilliant-cut gemstone having a pavilion, girdle, and crown is disclosed. The pavilion of the gemstone has 56 facets: specifically, 8 lower diamond-shaped facets, 16 middle kite-shaped facets, and 32 upper triangular facets. The girdle and table may be formed of one or more facets. In one preferred embodiment, the total number of crown facets (excluding the table) is 56, making a total of 114 facets (including the table). In another preferred embodiment, the total number of crown facets (excluding the table) is 64, making a total of 122 facets (including the table).

Abstract: A cut design for diamonds having a crown of substantially a frustum shape and substantially a conic pavilion directly under the frustum part, the diamond being enhanced in the brilliancy and scintillation of its crown part, the brilliancy and scintillation twinkling, and bluish lights being returned as reflected lights. A crown angle c and a pavilion angle p are so determined that lights coming in crown facets and emitted from crown facets, lights coming in the table facet and emitted from the crown facets, and lights coming in the crown facets and emitted from the table facet be directed toward the observer at the same time. Further, it is preferable to determine the crown angle c and the pavilion angle p so that the angles formed by incident lights and emitted lights are substantially equal to each other. Its table diameter should be between or equal to 0.60 and 0.33, more preferably not more than 0.55 and even more preferably not more than 0.38, in its ratio to the girdle diameter.

Abstract: A microinscribed gemstone is inscribed by a laser beam to graphitize a surface portion of the gemstone without damaging a bulk portion.

Abstract: The multi-faceted combined cut gemstone has the most facets in the history of gemstones. The King David cut with 104 facets makes the most brilliant, sparkling and eye-pleasing gemstone at the time it was developed. The Queen Batt-Sheva cut with 128 facets makes an even more brilliant; sparkling and eye-pleasing gemstones. Both of these gemstones have square tops and round bottoms. This combination makes them most fiery and sparkling cut in the world.

Abstract: A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.

Abstract: A decorative jewelry stone and process for developing the stone. The process includes providing a primary stone and defining a cutting plane on the primary stone. The primary stone is then cleaved at the cutting plane to produce first and second portions, each of the first and second portions having a planar surface. A cavity is then bored into the planar surface of one of the first and second portions of the primary stone. A secondary stone is then placed within the cavity and a bonding agent is applied to the planar surface of one of the first and second portions. The planar surfaces of the first and second portions are then placed against one another allowing the bonding agent to cure and thereby permanently fix the first and second portions together sealing the secondary stone therebetween.

Abstract: In accordance with the present invention, there are provided methods for enhancing the color of gemstone(s) by subjecting a combination of a gemstone and at least one finely divided form of a selected treating agent including the element copper to a temperature in the range of about 700° C. up to about 1000° C., for a time period in the range of about 3 hours up to about 600 hours, under conditions suitable to enhance the color of the gemstone, wherein the treating agent consists of a finely divided form of the selected treating agent such as copper metal or copper oxide, and wherein said gemstone is topaz or sapphire and the enhanced color lies in the color spectrum of light yellow to red.

Abstract: A gemstone includes four equal concave portions, a table, a girdle, an upper portion and a lower portion. The upper portion has two stairs. The lower portion includes four surfaces which are broken by eight additional surfaces. Each of the eight surfaces is broken by another two surfaces.

Abstract: A novel gemstone cut comprising a crown, a girdle, and a pavilion is described, wherein the gemstone includes precious gemstones (such as diamonds) and semi-precious gemstones. The crown includes an octagonal table, which is surrounded by eight triangular star facets. Eight table bezels are disposed in-between the star facets and eight mid-bezels are disposed in-between the table bezels. Furthermore, the gemstone's pavilion has eight concentrically arranged culet pavilion facets, a girdle pavilion facet and a bottom small break facet that are disposed in-between the culet pavilion facets. The gemstone's girdle has eight left top half facets and eight right top half facets (located in-between the girdle bezels of the crown), and eight left bottom half facets and eight right bottom half facets (disposed in-between the girdle pavilion facets and bottom small break facets).

Abstract: A high yield diamond includes a table lying in a table plane, a girdle lying in a girdle plane that is substantially parallel to the table plane, main crown brillianteering facets lying between the table and the girdle at an angle between 23° and 40°, and a pavilion lying between the girdle and a culet. The pavilion includes upper pavilion brillianteering facets lying between the girdle and a first pavilion rib line, and lower pavilion brillianteering facets lying between the rib line and the culet. The upper pavilion facets lie at an angle of between 45° and 80° relative to the girdle plane. The lower pavilion facets lie at an angle of between 35° and 45° relative to the girdle plane. The rib line lies at a point between one-fifth and four-fifths of the distance between the girdle and the culet.

Abstract: A high yield diamond and method of producing same. The diamond includes a plurality of main crown facets adjacent a table lying at an angle of between 23° and 40° relative to the table, a girdle, a plurality of upper pavilion facets below the girdle lying at an angle of between 45° and 80° relative to the girdle plane, and a plurality of lower pavilion facets formed between the upper pavilion facets and the culet. The upper pavilion facets extend from between one fifth to four fifths the height of the pavilion. The method is directed to a process for blocking the pavilion of the diamond prior to performing any brillianteering steps.

Abstract: A cut design of an ornamental diamond and an observation method of the diamond which an observer can perceive a more beauty, are disclosed. The cut design is a round brilliant cut comprising a girdle, a crown above the girdle and a pavilion below the girdle. A girdle height (h) is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) of a pavilion main facet ranges from 37.5 degrees to 41 degrees, and a crown angle (c) of a crown main facet is within a range of satisfying: c>−2.8667×p+134.233 and p<¼×{(sin−1(1/n)+sin−1(1/n·sin c))×180/&pgr;+180−2c}, wherein n: refraction index of a diamond, &pgr;: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees.

Abstract: Disclosed are a new diamond cutting method and a diamond shape or proportion giving an increased brightness and different brilliant colors to the cut jewel. A piece of diamond having a crown or bezel and a pavilion converging up and down from its girdle is prepared; the table of the crown is cut into a regular polygon having straight sides of an integer multiple of three; star facets, upper-main facets and paired upper-girdle facets are formed on the oblique annular surface between the polygonal table and the girdle; and lower-girdle facets and lower-main facets are cut on the pavilion. The height of the diamond piece is approximately 64% of the diameter of the girdle; the height of the crown is approximately 15.7%; the height of the pavilion is approximately 48.3%; and the largest width of the girdle is approximately 1.2 to 1.4%. The angle formed between the ridge of the crown and the ridge of the pavilion is approximately 77 degrees.