674 results about "Gemstone" patented technology

A fixed abrasive tool incorporating nanodiamond particles is described and disclosed. A fixed abrasive tool can include a polishing layer on a substrate. The polishing layer can include an organic matrix with nanodiamond particles therein. The polishing layer can be formed in a wide variety of configurations, depending on the specific polishing application. Most often, the polishing layer can include a plurality of projections which can have a wide variety of configurations in order to achieve a particular polishing performance. Nanodiamond particles used in the present invention can have a particle size from about 1 nm to about 50 nm, and preferably about 2 nm to about 10 nm. Optionally, the nanodiamond particles can include a carbonaceous coating. Such fixed abrasive tools can be formed by screen printing of a slurry of nanodiamond particles and an organic binder to form a predetermined three-dimensional pattern. Other methods can also be used to form the disclosed nanodiamond fixed abrasive tools. These fixed abrasive tools are particularly suitable for polishing expensive workpieces such as silicon wafers, integrated circuitry, gemstones, and hard drive platters.

A method and associated apparatus (5) for the standardized grading of gemstones is provided. The system gauges the spectral response of a gemstone subject to a plurality of incident light sources (77, 64, 90, 92, 102) within an imaging apparatus. The operation of the imaging apparatus is controlled by an instruction set of a local station control data processor (12). Light energy data is captured in the form of pixel data sets via a charge coupled device of the imaging apparatus of the local station (8). The control data processor data of the local station is operably linked to analysis station (14). Gemstones qualities are analyzed by the plurality of light sources (92, 90, 102) of the imaging apparatus (5) and quantified relative to model pixel data sets of the database and recorded for future reference therein.

An online database method, comprising marking a plurality of gemstones with respective identifiers; maintaining a database linking the identifiers with at least a portion of at least one of a transaction history and a subjective description of the plurality of gemstones; updating the database with an economic value based on transactions involving respective gemstones; determining normalization parameters for extracting objective parameters determinative of value for each of a plurality of gemstones from the respective subjective description of the gemstones; and predicting a market value for a respective gemstone based on the subjective description of the respective gemstone, the normalization parameters, and the transaction history of a plurality of gemstones.

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. The dot-shaped marks engraved at a depth below the surface of a gemstone can be made undetectable with the unaided eye or with a loupe by limiting their individual size to a few micrometres, while devising indicia made up of only a few marks. As a result, the marking does not detract from the appearance and value of the gemstone. The procedure for laser marking accounts for the random spatial distribution of the defects present in natural gemstones as well as for their strongly localized character. The presence of an indicium can be detected by using a dedicated optical reader that can be afforded by every jewellery store.

A time display device (“TDD”)—equally adaptable to watches, clocks, computers, phones, and vehicles—indicates the current hour of the day by displaying a color that refers an observer to the disclosed color-to-hour matrix, thereby eliminating the traditional hour hand or digit altogether. Alternately adaptable to months, the system may be used with both mechanical and electronic displays. Various disclosed minute indicators provide minute indication by shape, complexity, company logo, air bubbles, or other novel methods. Environmental sensors allow switching between functions. TDD appearance is user-customizable via Internet. Birthstones, gemstones, and precious metals are alternately used as stand-alone time indicators.

A gemstone micro-inscription system, comprising an energy source, a spatial light modulator, and a control, the control controlling a spatial light pattern modulation of the spatial light modulator, wherein the spatial light modulator exposes a photoresist on the gemstone, which selectively impedes an etching process to produce a pattern on the gemstone corresponding to the spatial light modulation pattern.

A method of constructing a virtual model of a gemstone including the steps of performing measurements of the gemstone to construct a three-dimensional (3D) model of an exterior surface of the gemstone; identifying one or more visible inclusions within an interior volume of the gemstone; for each identified inclusion, performing the steps of determining a location and 3D shape of the inclusion within the interior volume of the gemstone; capturing at least one image of the inclusion; using the at least one image to determine relevant optical characteristics of the inclusion; and constructing a 3D virtual model of the inclusion, said model including the 3D shape of the inclusion and optical properties of the inclusion based upon said optical characteristics; constructing a 3D virtual model of the gemstone which includes the 3D virtual model of the exterior surface of the gemstone and the 3D virtual models of the one or more visible inclusions within the interior volume of the gemstone; and generating a dataset representing said 3D virtual model, wherein said dataset may be used in subsequent computer analysis to provide a user with information relating to a visual characteristic of the gemstone.

A system for grading the cut of a diamond utilizes a number of appearance metrics to generate scores for a number of cut components that affect cut quality. These cut components include brightness, fire, scintillation, overweight, durability, polish, and symmetry. The cut grading system employs a cut grading algorithm that processes the individual scores obtained for the cut components to generate an overall cut grade for the diamond. The scoring methodology and the cut grading algorithm are designed to emulate actual observation grading such that the overall cut grade represents a fair indication of the cut quality of the diamond. In one practical embodiment, the cut grading system is fully automated and computer-implemented.

An apparatus for determining location of at least one inclusion in a gemstone having a first refractive index, comprising:

• • a container adapted for containing a material having a second refractive index,
  • a holder operative to support a gemstone in the material when the container contains the material;
  • an illuminator positioned and adapted to illuminate said gemstone when disposed within said material in said container, with illumination at which said gemstone and said material have their respective first and second indices;
  • a detector that detects illumination from the illuminated gemstone and said material and produces signals responsive thereto;
  • a controller that receives the signals and is operative to determine a location of an inclusion in the gemstone based on the signals; and
  • a system, operative to reduce the presence within said material, at least when the gemstone is disposed therein, of any substance other than inclusions, having a third refractive index.

The present invention relates to dry refractory compositions having excellent thermal insulation values. The dry refractory composition also has excellent resistance to molten metal and slag. The composition comprises a lightweight filler material selected from the group consisting of perlite, vermiculite, expanded shale, expanded fire clay, expanded silica-alumina hollow spheres, vesicular alumina, sintered porous alumina, alumina spinel Stone insulating aggregate, ettringite insulating aggregate, expanded mullite, cordierite and anorthite, and a matrix material selected from the group consisting of calcined alumina, fused alumina, sintered magnesia, fused magnesia, Silicon fume, fused silica, corundum, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, sialonite, titanium dioxide, barium sulfate, zircon, sillimanite Group of minerals, pyrophyllite, fire clay, carbon and calcium fluoride. The composition may also contain dense refractory aggregates selected from the group consisting of calcined clay, calcined clinker, minerals of the sillimanite group, calcined bauxite, pyrophyllite, silica, zircon, baddeleyite, cordierite , corundum, sintered alumina, fused alumina, fused quartz, sintered mullite, fused mullite, fused zirconia, sintered zirconia mullite, fused zirconia mullite, sintered magnesia, Fused magnesia, sintered spinel and fused spinel refractory clinker. The composition also contains a heat activated binder and a dust suppressant.

A non-ablative laser machining method and apparatus for cutting facets of a diamond, using a material machining technique involving filamentation by burst ultrafast laser pulses well suited to mass production. Coupled with 3D modeling and the computerized laser machining system, complex geometric surfaces can be created on the diamond. The facets of the diamond need not be planar in configuration, and may incorporate acute as well as oblique angles. This method minimizes the need for diamond polishing, speeds up production, and realizes great reductions in the quantity of lost material from the cutting process.

A method to apply nano-crystalline diamond onto a selected substrate, including preparing Nanodiamond slurry of nanodiamond particles dispersed in a medium. The medium may include a liquid or a sol-gel. The selected substrate is immersed in the Nanodiamond slurry for a predetermined period of time. Then the substrate is removed from the slurry. The substrate is then dried with a flow of inert gas. The substrate is left coated with a coating of the nanodiamond particles that are highly adherently held by van der Waals forces.

The present invention presents a non-destructive method and means of obtaining either the inner portion or the outer contour of a two-dimensional or three-dimensional model of the outer contours of a gemstone. The method comprising the steps of placing the gemstone on a holder such that the gemstone to be scanned is located in a radiation path comprising inter alia at least one emitter and at least one detector synchronized by a processor; radiating said gemstone by means of said emitter; detecting the emitted irradiation by means of said detector; processing said detection such that a two-dimensional in-scan of said gemstone is obtained by means of said processor; displacing the gemstone in respect to said emitter and said detector; repeating steps (b) through (e) for a plurality of predetermined displacements; and, if a three-dimensional model is required, integrating the obtained multiple two-dimensional in-scans into a three-dimensional model of the gemstone's outer contours; wherein the emitter is an irradiation delivery device, selected from a group consisting of either monochromatic or white light, UV or IR emitters; X-ray radiation source and/or collimator of the same; NMR, CT, NQR and/or MIR scatters; beta radiation emission devices; gamma radiation emission devices; laser beam cannons; photons cannons; microwave or RF emitters; sonic or ultrasonic emitters or any combination thereof.

Of the “four C's,” cut has historically been the most complex to understand and assess. This application presents a three-dimensional mathematical model o study the interaction of light with a fully faceted, colorless, symmetrical round-brilliant-cut diamond. With this model, one can analyze how various appearance factors (brilliance, fire, and scintillation) depend on proportions. The model generates images and a numerical measurement of the optical efficiency of the round brilliant-called DCLR—which approximates overall fire. DCLR values change with variations in cut proportions, in particular crown angle, pavilion angle, table size, star facet length, culet size, and lower girdle facet length. The invention describes many combinations of proportions with equal or higher DCLR than “Ideal” cuts, and these DCLR ratings may be balanced with other factors such as brilliance and scintillation to provide a cut grade for an existing diamond or a cut analysis for prospective cut of diamond rough.

A system for analyzing the chemical composition of a sample, comprising exciting a portion of the sample to generate atomic spectral emissions; a spectrometer for determining atomic emission characteristics; processor for receiving an output from the spectrometer, analyzing said output to determine atomic composition, said processor predicting at least one of (i) an origin of the sample, (ii) a treatment applied to said sample, (iii) a composition of the sample, and (iv) a feedback signal for controlling a process. Calibration samples are also provided for standardizing readings from the spectrometer.

Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base.

The invention comprises a two-step process for achieving an ultra-polish finish on materials such as gemstones and the like by first performing a chemical-mechanical polishing of the material using an intermetallic material as the grinding medium followed by a gas cluster ion beam (GCIB) treatment. The intermetallic grinding wheel is formed of carbide-forming metals in the form of intermetallics consisting of one kind or more of elements selected from the group of Al, Cr, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Os, Ir and Pt, and one kind or more of elements selected from the group of Ti, V, Zr, Nb, Mo, Hf, Ta and W. The gas cluster ion beams are comprised of gas clusters having nano-sized aggregates of materials that are gaseous under conditions of standard temperature and pressure. Such clusters can be ionized by electron bombardment or other means, permitting the gas clusters to be formed into directed beams of known and controllable energy. The larger sized gas clusters are the most useful because the larger sized gas clusters are able to carry substantial energy per cluster ion, while yet having only modest energy per atom or molecule.

An inventive method and system for allowing visitors of a web site to customize design elements into a final unique design through the use of an intuitive drag-and-drop or click-and-place method of assembly is presented. The inventive method and system enable better simulation of the highly visual, interactive, experimental and iterative creative design process employed by people when building artistic designs including jewelry. The drag-and-drop or click-and-place technique of putting gemstones into settings is analogous to an artist creating a painting by iteratively picking up a particular paint color with a paintbrush and placing the selected paint on a particular spot on a canvas.

An apparatus and method for fluorescence spectral and color measurements of diamonds, gemstones and the like. The apparatus comprises a spectrometer, and computer and a dual integrating sphere measurement arrangement comprising a measurement integrating sphere, a sample integrating sphere, a sample platform, a lens system, a baffle, an ultraviolet radiation source on the top of the sample integrating sphere, and another light source attached to the measurement integrating sphere. The sample on the sample platform is radiated by the ultraviolet radiation source on the top of the measurement integrating sphere. The sample emits fluorescent light into the measurement integrating sphere, and the fluorescent light is received by the lens system. The spectrometer separates the fluorescent light into spectral signals, and the computer calculates the fluorescence spectrum and colorimetric data.

The invention provides a gemstone or a decorative object having at least one surface bearing a thin film coating. In some embodiments, there is provided a gemstone having an appearance characterized by at least two different color zones, where such two zones are of different colors. In other embodiments, two different areas of a single (e.g., integral, one-piece) gemstone carry coatings of different composition, and the resulting appearance of the gemstone is characterized by the stone exhibiting substantially a single uniform body color that is different than the body color the stone would exhibit if it were coated only with one or the other of the coatings. Also provided are new deposition techniques.

A method of determining the position of inclusions in a gemstone, comprising:

(a) placing the gemstone within a material having a refractive index within 0.5, optionally 0.2 or 0. 1, of that of the gemstone;

(b) illuminating the gemstone and imaging the illuminated gemstone; and

(c) determining the position of inclusions based on images of the inclusions in the images.

The invention discloses a method and a detection device used for distinguishing natural gemstone and synthetic gemstone. The method comprises following steps: continuous wave band ultraviolet light with a wavelength ranging from 220 to 360nm is used for irradiating sample surfaces; sample surfaces and surface right lower regions are irradiated; fluorescence and phosphorescence are excited so as to form fluorescence images capable of reflecting growth of the irradiated regions, and phosphorescence illuminate images are formed when irradiation is shut down; image characteristic difference is obtained via observation based on the fluorescence images and the phosphorescence illuminate images so as to determine that the detected samples are natural gemstone or synthetic gemstone; if the images are not capable of emitting phosphorescence and blue white fluorescence, and horny growth patterns are observed, the detected samples are natural gemstone; if the images are capable of emitting phosphorescence, blue green or yellow green fluorescence, and layered growth structures and octagonal growth structures are observed, the detected samples are synthetic gemstone. According to the method, only the surface regions of gemstone are irradiated without influences by other factors, and it is possible to determine the detected samples are natural or synthetic based on patterns, or fluorescence, or phosphorescence generated by the gemstone samples.