Abstract: A method for preparing a diamond having a six-pointed-star shaped girdle comprising: (1) providing a round diamond; and (2) grooving six equally spaced, equally-sized triangularly-shaped 120° angled grooves in the girdle of the round diamond. Also disclosed is a grooving machine comprising a dop, wherein the dop may be rotated between six equally-spaced stops.

Abstract: A gemstone having a crown and a pavilion, spaced by a girdle, has an overall hexagon configuration, the signature of the stone. Facets are cut in the crown of the stone defining an hexagon table and an hexagram in the crown. Six (6) trapezoids frame the hexagram and high light the signature of the stone. Facets are cut in the pavilion of the stone so that the hexagonal signature of the stone is maintained. A sharp, six (6) pointed geometric figure is formed by six (6) trapezoid facets cut in the pavilion of the stone, each trapezoid extends from the apex of the stone, toward the girdle. Pairs of triangle facets cut in conjunction with the trapezoids soften the sharp, six (6) pointed geometric figure. The hexagonal figure on the pavilion which is symmetrical with the hexagram in the crown and with the signature of the stone.

Abstract: A jewelry design including a mounting made of a precious jewelry metal, a plurality of fluorescent diamonds having at least medium blue fluorescent intensity which are set in the mounting to form a message, and a plurality of non fluorescent diamonds set within the mounting adjacent the fluorescent diamonds, such that when the mounting is viewed under standard light the fluorescent diamonds are not discernable from the non fluorescent diamonds and the message is not visible, and such that when the mounting is viewed under ultraviolet light the fluorescent diamonds emit visible blue light to form and reveal the message.

Abstract: An assembly of gemstones which fit together to form a unitary shape is provided. The stones preferably make up an oval and are preferably four in number. Two of the stones are smaller than the other two. The larger stones are approximately 5/3 the size of the smaller stones.

Abstract: A princess cut gemstone having a pavilion, a girdle, and a crown is disclosed. 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 relates to natural or artificial pearl in which one or more ornamental elements (4) are inserted in form of an inlay with or without a mount, wherein the outer visible top or ornamental side opposite the pearl of each inlay has a horizontal projection with a random contour and dimensions confined by the limits of the spherical surface and wherein the inner bottom side facing the pearl of each inlay is fitted with locking or anchoring means (20). Each inlay is lodged with positive-fit or at least substantially with positive-fit in an appropriately matching groove (6) (slot, cavity), locking and/or anchoring means being formed in the bottom and/or wall of said groove which interact with the corresponding inlay, preferably by positive locking according to the key-lock principle, and in or on which the inlay inserted into the groove is fixed in or on the pearl.

Abstract: A method of producing stone set jewelry includes the step of forming at least one affixation groove within the stone to be set in the jewelry. A stone to be set with the present method should have an upper and a lower portion which is at least substantially entirely hidden from view when the upper portion of the stone is viewed. In accordance with the present method the affixation groove should be formed in the lower portion of the stone such that it too is hidden from view when the upper portion of the stone is viewed. A heat setting method is disclosed for improving the bond between the pavilion of the stone and the wax model used in the casting process. The method also includes the deposition of a mounting material within the affixation groove by applying a conventional casting method.

Abstract: The present invention describes 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: 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: The invention relates to a method for determining a high-reflection cut of a gem, a method for cutting a high-reflection gem, and a cut high-reflection gem. According to the invention, the gems have at least three lower part main facets and at least three upper part main facets, the angle between the lower part main facets and the girdle plane being greater than the angle between the upper part main facets and the girdle plane. A table replaces the upper part main facets at an angle of 0°. The lower part main facet angle is between 41° and 46° and the upper part main facet angle corresponds to an angle from a group of predetermined preferred angles. The group of angles is determined according to the average refraction of light n (between 1.50 and 3.00) of the raw material being cut and the lower part main facet angle.

Abstract: A mixed cut gemstone having a brilliant cut crown, a girdle and a step cut pavilion. The step cut pavilion contains four rib lines running from the girdle to a culet, which can be a line or a point. These rib lines subdivide the pavilion into four sides, which, if the girdle is shaped like a square, are equivalent, and, if the girdle is shaped like a rectangle, then any two opposing sides are equivalent. The pavilion contains a multitude of steps, which add to an elegant and classic look of the gemstone. The crown contains a flat table in a form of a diamond, four corner facets and four upper girdle facets, thus, creating superior factors of dispersion, brilliance and scintillation. The table is slightly elevated due to the angles that the four corner facets and four upper girdle facets form with the girdle.

Abstract: A heart shape diamond and setting therefore including a first diamond section formed by cutting a first pear-shaped diamond along a first cutting plane to define a first mating surface and a first table; and a second diamond section formed by cutting a second pear-shaped diamond along a second cutting plane to define a second mating surface and a second table. A heart-shaped setting is provided having a first seating area and a second seating area separated by a cross bar, wherein the first diamond section is seated in the first seating area and the second diamond section is seated in the second seating area, with the first mating surface engaging the second mating surface to form the heart shape diamond, and with the first table and the second table forming the appearance of a single table of the heart shape diamond. Further, the first pear-shaped diamond has a first culet and the second pear-shaped diamond has a second culet, and wherein the heart shape diamond has both first and second culets therein.

Abstract: In order to produce on the table of a diamond gemstone, an information mark which is invisible to the naked eye using a x10 loupe, an ultraviolet laser having a wavelength of 193 nm is used in association with a mask irradiate the surface of the stone at a fluence of less that 2 J/cm2 per pulse and with not fewer than 100 pulses, in the presence of air which reacts with the diamond and causes the mark to be formed without any darkening which is visible when viewing a microscope.

Abstract: A brilliant gemstone cut, having a crown, a girdle and a pavilion. The crown and the pavilion are both brilliant cut. The crown has a flat table shaped as an equilateral n-sided polygon, n corner facets and n upper girdle facets. The girdle is also shaped as an n-sided polygon. The pavilion has n rib lines, which converge at a culet, n lower girdle facets, n bezel star facets and double n number of corner facets. The rib lines subdivide the pavilion into n equivalent parts.

Abstract: A gemstone has a faceted crown which is inclined with respect to the main axis and which is defined on the one end by a preferably flat table and on the other hand by a peripheral edge of the gemstone. A faceted pavilion is inclined with respect to the main axis, adjoins the peripheral edge, and converges to a tip. The facets (3) of the crown (2) are all inclined at the same crown angle (&bgr;) with respect to the main axis (1), while the facets (7, 7′) of the pavilion (6) are inclined at two different pavilion angles (&agr;1, &agr;2) with respect to the main axis (1). The first set of facets (7) of the pavilion (6) which are inclined at a first pavilion angle (&agr;1) extend to the peripheral edge (5), and the second set of facets (7′) of the pavilion (6) which are inclined at a second pavilion angle (&agr;2) start from the tip (8) without reaching the peripheral edge (5).

Abstract: The cut gem, in particular the diamond, has a predetermined number of cut facets in the crown (10) and in the pavilion about a central axis of geometric symmetry. The facets (25 to 27) are disposed about said axis of symmetry in a hexagonal arrangement. This geometric axis of symmetry preferably corresponds to one of the ternary crystallographic axes of the diamond. The girdle (12) separating the crown from the pavilion has a contour (20) of lobed shape with six rounded projecting portions and six rounded hollow portions (21, 22). The gem thus cut permits obtaining the original optical effects of brilliance and dispersion of light.

Abstract: A gemstone includes a crown portion and a girdle portion abutting the crown portion and extending along a predetermined plane. The crown portion has a plurality of crown facets provided on a surface thereof. The crown portion and the girdle portion each have eight longitudinal sections. At least one of the eight longitudinal sections of the crown portion have a first facet of the crown facets having a first edge bordering the girdle portion, and a second facet of the crown facets having a second edge bordering the girdle portion. A particular portion of the first edge abuts the second edge at a particular location. The first and second edges curve toward a center of the gemstone which is provided on the particular plane. The particular location is closer to the center of the gemstone than another portion of the first edge.

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.

Abstract: An information mark invisible to the naked eye is applied to the polished facet of a diamond gemstone by coating the diamond gemstone surface with an electrically conductive layer so as to prevent the diamond becoming charged, forming the mark with a focused ion beam, and cleaning the diamond surface with a powerful oxidizing agent to reveal a mark having an appropriate depth, which does not detrimentally affect the clarity or color grade of the diamond.

Abstract: A composite stone is formed of individual stones in which the faceting of the stones as viewed from the top is substantially identical. Providing a uniform faceting for each of the individual stones and substantially identical faceting for such stones provides an overall enhanced brilliance for the composite stone.

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 cut cornered mixed-cut square gemstone comprises a step-cut crown, with two steps and a table, a girdle and a pavilion. The crown and pavilion are substantially square with four equal sides, and corners about ⅓ the length of the sides. The pavilion sides and corners are defined by eight rib lines which extend substantially continuously from the girdle to a culet. Each pavilion side and corner has four facets, including a lower girdle star facet, two lower girdle facets and a lower bezel facet. The gemstone has the classic elegance of a step cut in the crown and attempts to achieve the good dispersion of a brilliant cut in the pavilion.

Abstract: An invisible information mark is provided on a facet of a diamond gemstone by applying a plasma resist to the exposed surface of the gemstone, applying an electrically conducting layer of metal to the region where the information mark is to be formed, ablating a selected zone of the metal and resist layers by ultraviolet laser thus forming a mask on the surface of the facet, electrically connecting the metal layer and plasma etching the facet through the mask, thus forming a mark of appropriate depth on the surface of the gemstone.

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 gem having a faceted crown which is inclined with respect to the main axis and which is defined on the one hand by a preferably flat table and on the other hand by a peripheral edge of the gem, and a faceted pavilion which is inclined with respect to the main axis and which adjoins the peripheral edge and which converges to a tip, wherein the facets (3) of the crown (2) are all inclined at the same crown angle (&bgr;) with respect to the main axis (1), while the facets (7, 7′) of the pavilion (6) are inclined at two different pavilion angles (&agr;1, &agr;2) with respect to the main axis (1), wherein the facets (7) of the pavilion (6) which are inclined at a first pavilion angle (&agr;1) extend to the peripheral edge (5) and the facets (7′) of the pavilion (6) which are inclined at a second pavilion angle (60 2) start from the tip (8) without reaching the peripheral edge (5).

Abstract: A gemstone includes a pavilion portion, a crown portion and a girdle portion provided between the pavilion portion and the crown portion. The crown portion includes a plurality of facets provided on a surface thereof. The crown portion can have eight longitudinal sections which collectively define it. At least one of the longitudinal sections includes a predetermined number of particular facets of the plurality of facets. Each of the particular facets has at least one edge that borders the girdle portion. A single facet of the particular facets is formed from cutting at least portions of at least two further facets of the particular facets. The gemstone can also be subdivided into two longitudinal half sections, with the crown portion of which having 12 facets that border the girdle portion of the longitudinal half section.

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: The links (8) forming the bracelet (6) are articulated one after the other via cylindrical bars (9), these bars and links being held together by a flexible tie (10). The link (8) is made of a mineral material whose hardness is equal to or greater than 7.5 Mohs.

Abstract: Large single crystals of silicon carbide are grown in a furnace sublimation system. The crystals are grown with compensating levels of p-type and n-type dopants (i.e., roughly equal levels of the two dopants) in order to produce a crystal that is essentially colorless. The crystal may be cut and fashioned into synthetic gemstones having extraordinary toughness and hardness, and a brilliance meeting or exceeding that of diamond.

Abstract: An article useful as a gemstone or decorative object. A formed substrate is used as a base for an optical interference coating applied on the exterior of the substrate. The optical interference coating is made of alternating layers of materials with relatively high refractive indices and relatively low refractive indices, the refractive indices and thicknesses of the alternating layers being chosen so that at least part of the light of wavelengths between 400 nanometers and 700 nanometers incident on the article is reflected. The optical coating creates an interference filter formed of alternating layers of a material with a low refractive index and a material with a high refractive index. The article provides a visual appearance that is novel and different from other gemstones or decorative objects, either man-made or natural.

Abstract: A cut stone having a crown (21) and a pavilion (23), the crown having peripherically four indents orientated face to face and forming a cross, the apparence of the crown of the stone forming a butterfly. The crown defines centrally a table in the shape of a reversed trapeze surrounded by facets defining two wings located toward the outside of the trapeze. The pavilion (23) comprises a number of facets distributed according to orientation angles combined to create a void of brilliance in the area of the indents. Under the table of the crown appears the reflection of the pavilion which uncovers two flapping wings located internally; the flapping wings added to the two wings at the exterior of the trapeze, give the appearance of a lepidopter.

Abstract: A clear crystalline faceted substrate is provided with a coating of a colored transparent ink in order to enhance the appearance of the otherwise inexpensive gem stone. The ink is a permanent type ink made from n-propanol, n-butanol and diacetone alcohol which is soluble in a solution having a isopropyl alcohol 99% strength. Once the coating has been applied to a substrate such as a cubic zirconia to enhance the appearance of the gem stone, the coating can be removed by use of the solvent. A fresh coating of a different color may then be applied.

Abstract: A uniquely mating jewelry item includes a first stand-alone jewelry piece including a first gem part which has been cut along a separation line from a gemstone, the first gem part having a first outer surface with one-of-kind, naturally occurring markings thereon and a first mating surface different from the first outer surface and extending along and to one side of the separation line, and a first jewelry holder secured with the first gem part for holding the first jewelry piece on a support such that the first outer surface and the first mating surface are exposed and visible; a second stand-alone jewelry piece including a second gem part which has been cut from the same gemstone, the second gem part having a second outer surface with one-of-kind, naturally occurring markings thereon and a second mating surface different from the second outer surface and extending along and to an opposite side of the separation line, and a second jewelry holder secured with the second gem part for holding the second jewelry

Abstract: An adjustable ring is provided which consists of pivotally linked sections. One section is made of two telescopically engaged parts. One of these parts includes holes. The other part includes an axially displaceable element mounted on a pivotal segment of a decorative structure of the ring for engaging in the holes.

Abstract: A combination precious or semi-precious stone setting is formed utilizing princess or square cut stones having their edges lopped off, with at least two of the stones joined edge to edge forming a space where the lopped off corners were located, further including a square cut stone placed in this space to form a novel and enhanced appearing jewelry setting.

Abstract: Simulated diamond gemstones are produced by faceting and polishing bulk single crystals of colorless synthetic aluminum nitride or aluminum nitride:silicon carbide alloys.

Abstract: A gemstone, on which respectively at least four facets of equal size have been cut in the upper part and the lower part above and below the girdle plane, which have a parallel base edge, wherein the angle (.alpha.) between an upper part facet (20 . . . 23) and the girdle plane is less than the angle (.beta.) between a lower part facet (10 . . . 13) and the girdle plane. Between the lateral edges of the lower part facets (10, 11, 12, 13) one group (40 . . . 43) of narrow, triangular additional facets, which extend fan-like from a girdle plane, is provided. The narrow sides of the one group of additional facets meet in the connecting lines between the tips of the lower part facets (10, 11, 12, 13) and the narrow sides of the additional facets of a respectively neighboring group.

Abstract: A jewelry system is provided including a necklace assembly having opposed ends that are connectable to one another by releasably lockable primary finding components. The necklace assembly further includes auxiliary findings that are unobtrusive and that enable portions of the necklace assembly to be disassembled. The disassembled portions may be reconfigured to form either a single our double-strand bracelet or for incorporation into a pin. The system further includes connectors for holding adjacent strands of a double-strand bracelet in substantially parallel relationship to one another. The system further includes at least one pin base for connection to portions of the disassembled necklace such that the combined pin base and portions of the necklace function as a pin.

Abstract: A new structure for a colored gem, generally round or oval, in which a barrel cut is employed, but which has a center top edge and transverse boundaries which increases the thickness of the stone with additional facets provided to enhance reflection and overall brilliance.

Abstract: A composite stone which includes a first half-stone having a mating edge with a first length and a second half-stone having a mating edge with a second length which is approximately equal to the first length is provided. At least a first baguette and a second baguette are mounted between the first and second half-stones. Each of the at least first and second baguettes has a first mating edge and a second opposing mating edge which have a third length that is approximately equal to the first length. The first mating edge of the first baguette is generally aligned with the mating edge of the first half-stone. The second mating edge of the second baguette is generally aligned with mating edge of the second half-stone. The second mating edge of the first baguette faces the first mating edge of the second baguette.

Abstract: A tooth or teeth jewels comprising highly clear gems such as diamond, zirconia, quartz, white sapphire or the like fixed as partially buried in a concavity formed in a live or artificial tooth or teeth, the tooth or teeth jewels being secured to the tooth or teeth by means of a gem retainer made of a high-reflectance metal or resin which provides a golden, silver or platinum color and/or brilliance, or by means of a combination of the gem retainer and a colored reflective film

Abstract: A cut cornered mixed-cut square gemstone comprises a step-cut crown, with two steps and a table, a girdle and a pavilion. The crown and pavilion are substantially square with four equal sides, and corners about 1/3 the length of the sides. The pavilion sides and corners are defined by eight rib lines which extend substantially continuously from the girdle to a culet. Each pavilion side and corner has four facets, including a lower girdle star facet, two lower girdle facets and a lower bezel facet. The gemstone has the classic elegance of a step cut in the crown and attempts to achieve the good dispersion of a brilliant cut in the pavilion.

Abstract: In accordance with the present invention, there are provided methods for enhancing the color of minerals useful as gemstones. Invention methods are relatively inexpensive to carry out, avoid the use of hazardous materials, and require no specialized equipment.

Abstract: Synthetic gemstones are produced by growing single crystals of silicon carbide, fashioning the silicon carbide into gemstone cores, and thereafter depositing a thin coating of diamond on the core.

Abstract: A jewelry ornament includes a jewelry ring having a base having a hole formed in a central portion thereof. A prong mount extends from the base, and a transparent or semi-transparent gem is held by the prong mount. A colored back-up material is at least partially positioned in the hole.

Abstract: A faceted gemstone having at least one thin layer of material coated on the pavilion of a transparent substrate so that the body of the gemstone appears to have a different color. The color of reflected light changes hues when viewed through the face of the gemstone at different angles of observation. This causes the gemstone to appear to change color when the stone is tilted. The thin film is coated by low temperature techniques such as sputtering.

Abstract: A bracelet includes a set of linked bases, each base including a first body, a pair of parallel extended portions connected to opposite edges of the body, a projection positioned on a bottom of each extended portion for applying a finger pressure, a beam fixedly mounted to an extending between ends of the extended portions, and a polygonal shaped arm having one end connected with the body and being movable between a raised postion, for inserting the beam of a second base between the arm and the body, and a folded postion to fix the beam of the second base between the arm and the first body; a lock member connected to one end of the linked bases; and a link member connected to the other end of the linked bases.

Abstract: A new structure for a colored gem, generally round or oval, in which a barrel cut is employed, but which has a center top edge and transverse boundaries which increases the thickness of the stone with additional facets provided to enhance reflection and overall brilliance.

Abstract: Apparatus and methods for decorating a gemstone with colored indicia so that the indicia is readily visible from an exterior surface of the gemstone. The indicia is engraved on an predetermined exterior surface portion of the gemstone. The exterior surface on which the indicia is engraved may be the exterior surface from which it is visible, or another surface. The gemstone may be semi-precious, man-made, or precious, and can be faceted or cabochon. The indicia is engraved in the exterior surface by a laser beam. The laser beam is directed to the exterior surface, while the gemstone is held in a manner so that a significant portion of the laser beam is precluded from reflecting internally within the gemstone, thereby ensuring that the gemstone is not damaged by the laser beam. Once engraved a colored inlay, e.g., paint, is provided in the engraved recess to complete the decorative indicia.

Abstract: A method for cutting and faceting a gemstone to provide a torus ring shape and gemstone provided thereby. A complete or partial torus is generated having a hole bored in the center through the pavilion and the crown. The method works with various gemstone shapes including round, marquise, oval and cushion. In a round gemstone, a pair of parallel planes are lapped and a circular hole concentric with a vertical axis of the gemstone and perpendicular to the lapped planes is drilled through the gemstone crown and pavilion leaving a torus ring shape. Inside and outside pavilion faces are carved to the desired shapes. Outside and inside crown angles are cut or carved to the desired shape. The various surfaces are sanded and polished. If desired, another gemstone may be set into the center of the hole in the crown using goldsmithing and/or lapidary techniques.