A diamond identification apparatus relates to the field of examining natural and synthetic diamonds. The claimed apparatus for identifying a cut diamond comprises a measurement location with a measuring aperture at which the cut diamond to be examined is fixedly positioned; a movable optical system including a spectrometer, two sources of radiation at wavelengths of 250-280 nm and 350-380 nm, respectively, said two sources of radiation and the spectrometer being connected to the measurement location by optical fibres for inputting radiation into the cut diamond and by an optical fibre for outputting radiation from the cut diamond; and also a source of laser radiation at a wavelength of 532 nm and a microcontroller, wherein the cut diamond is positioned at the measurement location in such a way that the table of the diamond faces the measuring aperture of the measurement location, and the culet of the diamond is situated directly above the measuring aperture to which the optical fibres for inputting radiation and the optical fibre for outputting radiation are connected, and wherein the microcontroller is configured to control the alternate operation of the sources of radiation in a set time sequence, the movement of the optical system to allow the input of radiation into the cut diamond, and the processing of the spectrometer data.

Resonant Ultrasound Spectroscopy (RUS) is applied to diamonds (both cut/polished gemstones and rough diamonds) to yield a digital fingerprint from which the stone may be authenticated and sorted according to the structural quality. Diamonds are mined as rough stones from which they undergo examination to determine their value as being gem, or of two different industrial qualities. Fewer than 25% of mined diamonds are worthy of cutting and polishing to yield gems for jewelry. About 40% of the remaining population still have value as industrial diamonds for machine tools, and the rest is ground into dust to provide coatings for grinding applications. Rough stones exist in two conditions being coated and uncoated. The coated stones have a layer of polycrystalline diamond, different from the predominant crystal structure, rendering them opaque. This interferes with optical inspection, as any cracks, or inclusions can't be seen. RUS provides a reliable sorting and fingerprinting system for both cut/polished stones as well as rough diamonds of sufficient structural quality to yield a spectral signature. As high value items, diamonds are shipped around the world, and but sometimes thefts occur. RUS yields a digital fingerprint allowing the identity of an individual stone to be verified upon recovery.

The application provides a diamond testing device. The testing device includes a casing, a movable specimen holder, an illumination unit, a light sensor unit, and a computing processor. In a closed position, the casing encloses the specimen holder, the illumination unit, and the light sensor unit.

The present invention discloses a method and system for certifying and verifying gemstones and a document certifying and verifying gemstones. The method comprises the steps of capturing at least one image of an inclusion in a gemstone; storing the image in a first database; and displaying the image on a certification document for presenting to a consumer, wherein the image is of sufficient magnification to allow the consumer to compare the image on the document to the gemstone viewed through an optical device to determine if the gemstone matches the image.

A method for identifying the presence of partly liberated diamonds in a material stream. The method including illuminating a material with a multi-wavelength beam including at least one monochromatic SWIR laser beam, and at least one IR scatter-/anti-scatter laser beam. A sorting process including ejecting objects including material classified as diamond from a transportation direction of the material stream.

Methods, apparatus, and systems for fabricating diffractive structures on gemstones for high optical performance are provided. In one aspect, a method includes obtaining a plurality of gemstone characteristics of a gemstone, determining that the gemstone exhibits each of the plurality of gemstone characteristics within a respective predetermined range, identifying a diffractive structure setting associated with a combination of the respective predetermined ranges for the plurality of gemstone characteristics, and fabricating diffractive structures on the gemstone according to the diffractive structure setting.

A multi-functional precious stone testing apparatus includes a portable housing, a testing unit, and an indication unit. The portable housing includes a hand-held casing and a probe casing extended from a front end of the hand-held casing. The testing unit includes a conductive probe, a sensor, and a UV light source for emitting UV light beam, so as to allow the sensor to sense the UV reflected and refracted by a testing object for determining various qualities of the testing object.

Provided herein is an apparatus for assessing a color characteristic of a gemstone. The apparatus comprises an optically opaque platform for supporting a sample gemstone to be assessed, a daylight-approximating light source to provide uniform illumination to the gemstone, an image capturing component, and a telecentric lens positioned to provide an image of the illuminated gemstone to the image capturing component. Also provided are methods of color analysis based on images collected using such an apparatus.

There is disclosed an apparatus and method for sorting gemstones from a batch of gemstones. The apparatus comprises one or more measurement locations, each comprising at least one measurement device configured to measure one or more properties of a gemstone. A continuously moveable surface supports the gemstones thereon and transports the gemstones to the one or more measurement locations. A separation device separates the gemstones from one another as they are transported on the moveable surface to the one or more measurement locations. A location trigger at a sensor location comprises a sensor for identifying when the gemstone passes through the sensor location. A controller receives a signal from the location trigger, records the position of the moveable surface when the signal is received, and tracks the subsequent location of the gemstone by monitoring the movement of the moveable surface such that a measurement of the one or more properties of each gemstone can be correlated with a location of the respective gemstone on the moveable surface. Specific markers in the luminescence properties of the gemstone may be used to identify properties of the stone.

A method for identifying the presence of partly liberated diamonds in a material stream. The method can include illuminating a material with a multi-wavelength beam including at least one monochromatic SWIR laser beam, and at least one IR scatter-/anti-scatter laser beam, capturing a portion of the at least one monochromatic SWIR laser beam after the monochromatic SWIR laser beam has been reflected and/or scattered by the material, producing a SWIR signal based on the captured portion of the at least one monochromatic SWIR laser beam, and capturing a first portion of the at least one IR scatter-/anti-scatter laser beam after the at least one IR scatter-/anti-scatter laser beam has been scattered and optionally reflected by the material.