Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) which may produce a “Hearts & Arrows” reflection pattern.

Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) Krupps cut gemstone.

Abstract: The present invention relates to a method of setting stones, preferably precious stones like diamonds, in a mounting comprising (a) setting a base metal having a floor with a central cavity; (b) placing a center stone as a first layer of stone, the center stone having a pavilion, a girdle and a crown, such that the pavilion is placed inside the above stated cavity, the girdle inserted in incisions in the peripheral walls of the base metal from the side; (c) placing each of the respective layers of stones adjacent and marginally above each other, each stone having a pavilion, girdle and crown such that the pavilion of each of the respective stones is placed in its respective cavity, the girdle of each stone being inserted in the incisions in the peripheral walls; such that the peripheral walls of each of the layer forms the base of the cavity of the next layer; stones in each of the layers are held only from one side by said peripheral wall; the stones of following layer marginally overlap the crown of the sto

Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) Asscher cut gemstone.

Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) Princess cut gemstone.

Abstract: A mounting holds a grooved gemstone invisibly to a setting. One end of the mounting has arms or extensions to receive the gemstone and protrusions extending inwardly from the arms to fit in the grooves of the gemstone, the mounting further comprising a holding configuration for holding the mounting to the setting. Insertion of the mounting into the setting may in one version distort the holding configuration and levers the arms to press harder into the groove.

Abstract: The present application discloses the details of a microwave plasma chemical vapor deposition process that uses Nitrogen and Diborane simultaneously in combination along with the Methane and Hydrogen gases to grow white color diamonds. The invention embodies using nitrogen to avoid inclusions and impurities in the CVD diamond samples and Diborane for the color enhancement during the growth of diamond. It is also found that heating of the so grown diamonds to 2000 C results in significant color enhancement due to the compensation of Nitrogen and Boron centers in the samples. The origin of the various colors in diamond is explained on the basis of the band diagram of CVD diamond.

Abstract: The present invention provides a diamond simulant with greater similarity to a diamond than cubic zirconia. The present invention further provides a diamond simulant with durability, hardness, and optical features closer to that of a genuine diamond that previously afforded by other diamond simulants, such as cubic zirconia.

Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) cushion-cut gemstone which may produce a “Hearts & Arrows” reflection pattern.

Abstract: An article of jewelry including a pliable strand; and a plurality of precious or semiprecious objects movably positioned along the pliable strand. Each of the plurality of objects including a magnetic insert extending between opposing surfaces, which itself is formed from two magnets separated by a magnetic stabilizer and aligned such that the opposing ends of the magnetic insert have the same polarity thereby creating repulsive forces between each of the plurality of objects along the strand.

Abstract: Various embodiments described herein comprise a gemstone or other piece of jewelry, which incorporates one or more diffractive optical elements to enhance the fire displayed by the gemstone. In certain embodiments, the diffractive optical element comprises a diffraction grating etched on one or more facets of the gemstone.

Abstract: An article of jewelry including a pliable strand; and a plurality of precious or semiprecious objects movably positioned along the pliable strand. Each of the plurality of objects including a magnetic insert extending between opposing surfaces, which itself is formed from two magnets separated by a magnetic stabilizer and aligned such that the opposing ends of the magnetic insert have the same polarity thereby creating repulsive forces between each of the plurality of objects along the strand.

Abstract: A heart shaped diamond possessing a hearts and arrows pattern characteristic comprising: eight main crown facets symmetrically aligned relative to one another, with each of the eight main crown facets having a straight edge in parallel alignment with a straight edge of another main crown facet disposed opposite thereto; eight main pavilion facets aligned at a fixed given angle of approximately 45° to each other and converging at a common point corresponding to the center of the diamond; sixteen pavilion half facets aligned at 22.5° with respect to each other, a girdle which is non-uniform and has a substantially unequal thickness throughout the diamond, a table facet, and a multiple number of crown star facets in an arrangement surrounding the table facet.

Abstract: The instant application discloses, among other things, a specific set of cutting proportions tailored for the optical characteristics of Silicon Carbide (“SiC”) which may produce a “Hearts & Arrows” reflection pattern.

Abstract: A triangular star shaped diamond adapted to display a hearts and arrows pattern when exposed to light comparable to the hearts and arrows pattern in a round diamond, comprising: six main crown facets, twelve crown half facets, a table facet, six main pavilion facets and an even number of main girdle facets separating the crown facets from the pavilion facets with each main crown facet having a symmetrical main crown facet in an opposing relationship and at least one edge in parallel alignment with an edge of the opposing main crown facet.

Abstract: The present invention relates to the cut of a gemstone, and particularly to facet patterns and arrangements for modified round brilliant cut gemstones having fifty-eight facets. In one embodiment, a facet pattern for the crown of a gemstone includes an octagonal facet; a plurality of triangular star facets; a plurality of triangular upper main facets; a plurality of upper girdle facets; a plurality of quadrilaterals lower main facets, a plurality of triangular lower main facets, and a plurality of lower girdle facets. Both the lower and upper girdle facets have at least one scalloped edge.

Abstract: A modified princess cut diamond and method of forming a modified princess cut diamond into a symmetrical shape possessing a hearts and arrows pattern characteristic of the true hearts and arrows pattern in a round cut diamond.

Abstract: A heart shaped diamond possessing a hearts and arrows pattern characteristic comprising: six main crown facets symmetrically aligned relative to one another, with each of the six main crown facets having a straight edge in parallel alignment with a straight edge of another main crown facet disposed opposite thereto; six main pavilion facets aligned at a fixed given angle of approximately 60° to each other and having a symmetrical number of pavilion half facets such that the six main pavilion facets meet at a point corresponding to the symmetrical central of the diamond and a multiple number of crown star facets spaced apart from one another on the surface of the diamond. The pavilion half facets are arranged in pairs polished on the main pavilion facet with a first pavilion half facet in each pair lying at a first angle of preferably 26.25° relative to a second pavilion half facet in the same pair and with the second pavilion half facet in each pair cut at a second angle of preferably 33.

Abstract: A gemstone cut is provided with a strategic placement of facets that optimizes the three dimensional optically geometric light interactions to thereby produce unique characteristics. In one embodiment, the gemstone has a crown with 29 facets, a pavilion with 28 facets and a girdle with 32 facets. The crown has a table with an octagonal shape, four first star facets, four second star facets, eight kite facets, eight first upper girdle facets and four second upper girdle facets. The pavilion can have eight pavilion facets, eight intermediate pavilion facets, eight first lower girdle facets and four second lower girdle facets. The girdle can have 32 facets including four sides each having seven facets and four facets at the corners of the gemstone interspaced between the side facets. The gemstone has four-fold mirror-image symmetry.

Abstract: A computer-implemented method teaches a user to evaluate a gemstone, such as a cut diamond. The method includes providing a computer system connected to an apparatus capable of capturing an image of a gemstone. The computer system is arranged to process a received image of a gemstone to determine one or more optical properties of the gemstone. In one aspect, the method presents on a display of the computer system a series of pre-stored screens comprising a graphical representation how the cut of a gemstone affects its light handling ability, and a user interface screen. The user interface screen allows the user to control the operation of the apparatus to measure the one or more optical properties of a particular gemstone provided to the apparatus, to view an image of the gemstone measured, and to view representations of the measured one or more optical properties.

Abstract: Gemstone of natural diamond, characterised in that the gemstone (1) has two parallel faces (2-3, 4-5) in which the geometric plane that coincides with the aforementioned faces defines the volume of the gemstone (1), and from which a number of facets start, and each facet is parallel to an opposite facet or parallel to a connecting edge (6) of two other facets.

Abstract: A flat substrate bears a set of flat, coplanar diffraction gratings; a jewelry mounting is secured to the substrate. The gratings are arranged to occupy corresponding areas of the substrate that are arranged to correspond to a two-dimensional projection of multiple, non-coplanar facets of a three-dimensional gemstone. Each grating differs from one or more other gratings with respect to grating wavevector direction so that each grating differs from at least one other grating with respect to direction of dispersion of spectrally dispersed output directions of a diffracted portion of light incident on the gratings along a given input direction. The grating wavevectors are spatially distributed among the corresponding gratings to form two or more subsets of three or more gratings along which subsets the corresponding grating wavevector direction of each grating of the subset varies monotonically with position of that grating along a given dimension of the substrate.

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: A setting for a gemstone including a girdle, a crown on one side of the girdle, and a pavilion on the opposite side of the girdle, characterized in that the setting mounts the gemstone in an inverted orientation such that the pavilion faces outwardly of the setting and the crown faces inwardly of the setting.

Abstract: An embedded gem and a method for embedding a gem are disclosed. An embedded gem includes a first gem and a second gem. The first gem includes a recess. The recess has an opening at the location of the table. The first gem has a first diameter. The second gem is coupled to the first gem. The second gem has a second diameter that is less than the first diameter of the first gem. The resistive fit within the recess of the first gem couples the first gem to the second gem. At least a portion of the second gem is within the recess.

Abstract: Gemstone with a chaton cut, in which tapering facets of a crown adjoin a flat table all the way round inclined relative to the table, the said facets extending as far as a rondist at which the gemstone has the largest transverse dimension, wherein a pavilion of facets preferably terminating at a point adjoins below the rondist, and wherein the gemstone is at least partially made of glass, and wherein the crown angle (?) is between 40.5° and 42.5°.

Abstract: An article comprises a volume of material having at least one faceted or curved surface, and at least one diffraction grating on at least one surface of the article. The diffraction grating comprises a set of diffractive elements formed in a deformable layer attached to the surface of the article. A method comprises forming the set of diffractive elements by deformation of the deformable layer, and attaching the deformable layer to a surface of the article. The layer can be deformed to form the diffractive elements before or after it is attached to the surface of the article.

Abstract: A gemstone cut with a table facet, where the gemstone receives existing light from around the viewer and the facets on the bottom of the diamond effectively reflect the existing light back into the eyes of the beholder in such a manner as to maximize light performance, and to produce a unique and distinct look of light in the form of a flower with eight rounded pedals under the table facet which can be observed in natural ambient light.

Abstract: An ornamental diamond is provided as an extremely bright diamond with numerous reflection patterns when viewed from above its table facet and crown facets. The diamond has the same crown as the round brilliant cut and its pavilion consists of a first pavilion and a second pavilion separated by a horizontal division plane. The second pavilion is an octagonal pyramid and its side faces form second pavilion main facets. The first pavilion is a hexadecagonal frustum with a top face on the horizontal division plane and its side faces form first lower girdle facets. First pavilion main facets extend from the girdle and between the first lower girdle facets, into between the second pavilion main facets. The ornamental diamond having the two-stage pavilion is much more brilliant than and has twice as many reflection patterns as the conventional round brilliant cut.

Abstract: A method of incorporating a mark of origin, such as a brand mark, or fingerprint in a CVD single crystal diamond material, includes the steps of providing a diamond substrate, providing a source gas, dissociating the source gas thereby allowing homoepitaxial diamond growth, and introducing in a controlled manner a dopant into the source gas in order to produce the mark of origin or fingerprint in the synthetic diamond material. The dopant is selected such that the mark of origin or fingerprint is not readily detectable or does not affect the perceived quality of the diamond material under normal viewing conditions, but which mark of origin or fingerprint is detectable or rendered detectable under specialised conditions, such as when exposed to light or radiation of a specified wavelength, for example. Detection of the mark of origin or fingerprint may be visual detection or detection using specific optical instrumentation, for example.

Abstract: A gemstone including a substantially rectangular girdle, a crown extending in a first direction from the girdle, and a pavilion extending in a second direction from the girdle opposite the first direction. The gemstone has 65 uniquely arranged and angled facets, 25 of which are in the crown, and 40 of which are in the pavilion. The height of the crown is preferably between 9½ to 13½% of the width of the stone, the total depth of the stone is preferably between 63-70.9% of the width of the stone, and the width of the table is preferably between 60-68% of the width of the stone. The crown has four sides, a table, and four bezel facets each positioned at a respective corner of the crown.

Abstract: An article of jewelry and method of manufacture, including a pliable strand; and a plurality of precious or semiprecious objects movably positioned along the pliable strand. Each of the plurality of objects including a magnetic insert extending between opposing surfaces, which itself is formed from two magnets separated by a magnetic stabilizer and aligned such that the opposing ends of the magnetic insert have the same polarity thereby creating repulsive forces between each of the plurality of objects along the strand.

Abstract: A stone for jewelry is provided that includes a first layer made of a first material; a second layer made of a second material bonded to the first layer; and a third layer made of a third material bonded to the second layer. The second material or layer is preferably made of a colored gel sheet.

Abstract: Cut product manufactured from a rough (semi) precious stone material, more particularly from diamond, comprising a lower part (pavilion) with a bottom end (culet); an upper part (crown) with a number of facets and a top end (a point with table width 0 or a top surface (table) with a table width); and a girdle between lower part and upper part, wherein the lower part comprises a number of girdle pavilion facets which describe a first angle a1 relative to the plane of the girdle and a number of culet facets which each describe a smaller second angle a2 relative to the plane of the girdle; wherein the average second angle a2 lies between 28 and 38 degrees; and wherein the ratio of the table width and the width of the girdle is 0 to 0.40.

Abstract: A novel gemstone cut that has 162 facets such that the crown has 65 separate facets and the pavilion has 97 separate facets.

Abstract: Brilliant-cut gemstone, wherein the crown angle (?) is between 32.8° and 33.0°.

Abstract: Cut product manufactured from a (semi) precious stone material, more particularly from natural or synthetic diamond, comprising a lower part (pavilion) with a bottom end (culet); an upper part (crown) having a number of girdle bezel facets and a top end (a point with table width 0 or a top surface (table) with a table width); and a girdle between said lower part and said upper part, wherein said lower part comprises a number of girdle pavilion facets which describe a first angle ?1 relative to the plane of the girdle and a number of culet facets which each describe a smaller second angle ?2 relative to the plane of the girdle; and wherein the girdle bezel facets are in a twisted position with respect to the girdle pavilion facets in the sense that the bezel facets have perpendicular bisectors which are not coplanar with the perpendicular bisectors of the girdle pavilion facets; and wherein the ratio of the table width and the width of the girdle is 0 to 0.40.

Abstract: The disclosure relates to the inclusion of an image embedded in or on a single crystal diamond such that the image is part of the single crystal diamond structure. The disclosed methods use a combination of gemstone deposition processes and patterning processes to create single crystal gemstones with embedded color variations that can create externally visible two-dimensional or three-dimensional images in a seamless single crystal matrix without visible internal lines/interfacial boundaries. The image embedded image is differently colored from the surrounding diamond matrix. The color variation is accomplished by a change in the diamond growth conditions or treatment of the diamond.

Abstract: A gemstone and link assembly for forming a piece of jewelry. The gemstone is cut to provide enhanced brilliance and radiance. The gemstone is securely maintained within the link. The link is fabricated of reduced metal thus providing an aesthetically pleasing assembly.

Abstract: A gemstone and link assembly for forming a piece of jewelry. The gemstone is cut to provide enhanced brilliance and radiance. The gemstone is securely maintained within the link. The link is fabricated of reduced metal thus providing an aesthetically pleasing assembly.

Abstract: Various embodiments described herein comprise a gemstone or other piece of jewelry, which incorporates one or more diffractive optical elements to enhance the fire displayed by the gemstone. In certain embodiments, the diffractive optical element comprises a diffraction grating etched on one or more facets of the gemstone.

Abstract: A gemstone having a crown which includes a multi-faceted crown surface and planar opposed side facets. The multi-faceted crown surface is arcuate from the front to the back of the crown. The gemstone is mounted to form, along with like gemstones, an article of jewelry having a continuous diamond look.

Abstract: A gemstone arrangement that allows ambient light entering a primary gemstone through a pavilion to be directed out a crown at a desired location and angle is described. Ambient light is directed by at least one complementary gemstone comprising a crown and a pavilion. The complementary gemstone is orientated is a position near the primary gems such that light enters and exits the complementary gemstone through the crown or pavilion and is directed into the pavilion of the primary gemstone. Because of the selection and orientation of the complementary gemstone, ambient light directed by the complementary gemstone intersects the crown of the primary gemstone at an angle of incidence equal to or less than the critical angle for internal reflection and exits the primary gemstone. This gemstone arrangement can amplify the amount of light observed by a viewer from specified locations and angles of the crown of the primary gemstone.

Abstract: The object of the present invention is a setting for a gemstone or diamond having a groove cut, based on gemstone or diamond shape, which acts as the setting. The groove in the gemstone or diamond is on the side surface or edge or other parameter which surrounds the face of the gemstone or diamond. The setting material is inserted into the groove and connected together outside or inside the groove, forming the frame around the gemstone or diamond. Once the frame is connected it becomes the setting.

Abstract: A gemstone cut with a table facet, where the gemstone receives existing light from around the viewer and the facets on the bottom of the diamond effectively reflect the existing light back into the eyes of the beholder in such a manner as to maximize light performance, and to produce a unique and distinct look of light in the form of a Maltese cross under the table facet which can be observed in natural ambient light.

Abstract: Provided is a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating. Also provided is a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating. A method for making a jewelry ring comprising a substrate, a first coating of a metallic nitride or a metallic boride, and an external metallic coating is additionally provided. Further provided is a method for making a metallic article comprising a substrate comprising tungsten carbide, cobalt, tungsten, titanium, titanium carbide, zirconium, tantalum or aluminum; a first coating of a metallic nitride or a metallic boride; and an external metallic coating.

Abstract: Methods of fabricating improved gemstones and gemstones thus obtained are described. Roughness is introduced on facets of a gemstone through application of nanometer and/or micrometer sized features, to provide the facets with a hazy white-colored appearance. Alternatively, millimeter-sized reflective features can be applied on the facets, to form a gemstone with improved scintillation or play of light.

Abstract: The present disclosure relates to methods for improving the quality of diamonds by eliminating internal defects, such as cracks and vacant volumes, without the use of filler materials such as glass, thereby improving the diamond's optical performance or appearance. More particularly, the disclosure relates to a method of curing defects in a genuine or synthetic diamond or other gemstone by using Atomic Layer Deposition (“ALD”) processes to form atomic layers within vacant volumes or cracks in the diamond or gemstone. Alternatively, ALD may be used to form crystalline layers of a new diamond or other gemstone.

Abstract: A method for providing a protective coating and enhanced optical qualities to a gemstone. The method includes coating a first portion and a second portion of a gemstone with TiO2 doped with calcium oxide (TiO2+). The TiO2+ coated gemstone is next coated with a diamond like carbon (DLC) coating. The gemstone may be synthetic or natural. The composite gemstone, having been coated with both TiO2 and DLC, exhibits high refractivity and enhanced wear resistance and color.

Abstract: In a method of taking a star facet of a diamond and extending its length to the girdle (the outside perimeter) of the diamond, a shield style (obelisk-shaped) facet is produced in rounds and fancy cut diamonds, and on square and off squares it remains a three-sided facet but is made larger and longer. The facet becomes larger than it was previously. It becomes a five-sided facet when it was a three before (or a much larger three-sided facet on squares and off squares). The reason it becomes five-sided is because when the facet is extended it collides with the bezel and both upper girdle facets as it extends to the girdle on rounds and fancy cut diamonds. The new facet on square and off square becomes longer and larger but remains three-sided. When the new star facet of rounds, fancy, square and off square diamonds collide with the others it produces a new larger facet and makes an exchange of positions of the previous largest facet which is true of all rounds, fancy, square and off square.