Systems and methods here may be used for a setup of image capturing of a gemstone, such as a diamond, exposed to different light sources. Some examples utilize a setup that both sends light and captures the image through multiple dichroic beam splitters at pre-selected timing. The multiple light source and multiple dichroic beam splitter arrangement allows for multiple gemstones to be analyzed using multiple methods with minimal moving, changing, or adjusting the equipment for different samples.

A contactor made of a polycrystalline diamond, being configured to have a rotational axis through the center thereof, comprising a first portion having an inner end portion and a constant thickness in the radial direction, and a second portion having an outer end portion and a decreased thickness in the radial direction; the second portion has a first surface and a second surface continuous with the first portion, and a connection surface connecting the first and second surfaces; the angle formed by the first surface and the second surface is 100-150; the length between a first boundary between the first surface and the connection surface and a second boundary portion between the second surface and the connection surface is 1-10 m; the length from the rotational axis to the outer end portion is 1-10 mm; and the average particle diameter of diamond particles is 0.1-100 m.

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.

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.

A precious stone testing apparatus includes a testing circuit housed in a housing and tester probe unit extended from one end of the housing. The testing circuit includes a UVA/UVC LED module adapted to emit UVA LED light and UVC LED light onto a stone being tested and a heating system adapted to apply heat to the stone being tested. When the stone being tested is placed close to a testing end of a quartz light guide column, reflections of the UVA and UVC LED lights to the stone being tested are guided back to a UVA/UVC optical sensor while a thermal conductive tube encircling the quartz light guide column applies heat generated from the heating system to the surrounding of the stone being tested at the same time.

A building structure includes a block of building material and a magnetic circuit buried in the block of building material. The structure also includes a plurality of sensing devices buried in the block of building material. Each sensing device may include a contactless power supplying circuit magnetically coupled with the magnetic circuit to generate a supply voltage when the magnetic circuit is subject to a variable magnetic field.

An apparatus for viewing images of a gemstone is described. The apparatus comprises a support structure for supporting the gemstone at an observation position. An illumination structure comprises a plurality of directional light sources directed towards the observation position so as to illuminate the gemstone. The support structure and illumination structure are relatively rotatable relative to one another about a rotation axis. An imaging device is arranged to obtain images of the gemstone at the observation position at a variety of relative rotational positions between the illumination structure and support structure: the imaging device has an imaging axis passing through the observation position. The support structure is arranged so that the gemstone can be placed at the observation position in such a way that the normal to a selected facet of the gemstone is within a range of tilt angles from the rotation axis. The arrangement of directional light sources is such that, for any tilt angle within the range, at least one of the directional light sources will be specularly reflected from the selected facet into the imaging device for at least one rotational position of the support structure.

The origin of a gemstone often governs its value. Traditional jewelry appraisals attempted the recognition of the origin of a gemstone based on criteria of its physical properties include, but not limited to color, refractive indices, and microstructure. However, these criteria, in addition to its inclusions, are generally failed to resolve the locality and origin of a gemstone without doubt. Through careful examination and compilation of Raman spectroscopic data, Argyle pink diamonds can be classified as two types according to their characteristic Raman spectra. The method of the present invention provides sound basis for the rapid determination of the authenticity of the Argyle pink diamonds by Raman spectroscopy.

There is described an apparatus and method for inspecting and optionally sorting gemstones. The apparatus includes a nozzle or array of nozzles operatively connected to a vacuum pump such that a gemstone located generally underneath one of the nozzles will be supported against that nozzle by air pressure when a vacuum is applied above the nozzle. A drive system moves the nozzles along a path past a gemstone pick-up location so that a gemstone can be picked up by each nozzle as that nozzle passes the pick-up location. One or more measurement devices are located on or near the predetermined path and configured to measure at least one property of the gemstone. One or more ejection locations are provided on the path at which the vacuum applied to each nozzle is reversible to eject the gemstone from that nozzle. The apparatus may also include a plurality of dispensing bins into which the gemstones are dispensed. The bin into which each gemstone is dispensed is chosen in dependence on the measured property.

A magnifying device for jewelry and system for use of the same are disclosed. In one embodiment of the magnifying device, a securing ring is coupled to a body to selectively attach in a snap-fit engagement with a gem tester. A hinge assembly is also coupled to the body and a support frame is pivotally coupled thereto. A seat within the support frame defines a circular opening securing a magnifying lens therein. The support frame also includes a pivot blade extending therefrom that accepts rotational bearing force to cause the support frame and therefore the magnifying lens to rotate relative to the body.