A system (300) for providing a three-dimensional computer tomography image of a gemstone, the system (300) comprising an X-ray source (330) for providing an X-ray towards a gemstone (320); an X-ray detector system for detecting X-rays transmitted through or diffracted by the gemstone (320). The X-ray detector system surrounds the gemstone (320) and detects a three-dimensional multi-angle X-ray diffraction pattern from the gemstone (320) upon rotation of the gemstone (320) within the X-ray field, and provides an output signal therefrom, wherein the output signal provides for invasive three-dimension multiangle X-ray diffraction reconstructed computed tomography from the three-dimension multiangle X-ray diffraction pattern.

The invention relates to a detection arrangement, a detection system comprising said arrangement, and a method of processing data from said arrangement. The detector arrangement disclosed comprises at least one array of detectors, wherein the detectors are configured to detect photons emitted from an object as a result of positron annihilation due to irradiation of the object with photons of a predetermined energy. Each detector in the array is linked to or associated with one or more other detector in the array to define a region of interest (RoI). The detector arrangement comprises or is communicatively coupled to a coincidence trigger unit which is configured to register or determine a coincidence in response to receiving detection signals from two different detectors forming part of the same RoI and indicating detection of substantially back-to-back co-linear and co-incident photons in the RoI.

A method and apparatus for orientating discrete objects, such as gemstones, is described. The method comprises providing the objects on a travelling path; providing a pair of opposed walls (38) extending generally along the direction of the path; and generating relative oscillatory movement (14) between the pair of walls (38) and the travelling path (in a direction generally transverse to the direction of the path), so that the pair of walls (38) imparts lateral force to the objects to thereby urge them into their most stable orientation as they progress along the path. A device for checking the orientation of the discrete objects is also described.

The application provides a gemstone testing apparatus for testing a specimen. The gemstone testing apparatus includes a handheld casing, a plurality of light sources, a test probe, a photodetector, a processor unit, and a display unit. The test probe is placed at one end of the handheld casing. A first end of the test probe is placed outside the handheld casing. The plurality of light sources is provided for emitting light rays towards an area that is in the vicinity of the first end. The first end is adapted for receiving light rays from the specimen and for transmitting the light rays to a second end of the test probe. The photodetector is arranged to measure an intensity of the light rays from the second end. The processor unit is provided for determining a material of the specimen in accordance to a measurement of the intensity of the light rays.

Method(s) and System(s) for verifying authenticity of a gemstone (108) are described. The method includes receiving identification information associated with a gemstone (108). The identification information is indicative of at least one of a model number, a part number, a date, a time, and a gemstone ID associated with the gemstone (108). Thereafter, the gemstone (108) is analyzed to obtain an image pattern corresponding to the gemstone (108), the image pattern is based on refraction and reflection of a radiation incident on the gemstone (108). Thereafter, the method includes identifying a unique image pattern corresponding to the image pattern in a database. A stored identification information corresponding to the unique image pattern is then identified. The stored identification information and the unique image pattern are stored in the database for verification of the gemstone (108).

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.

Systems and methods for mobile gemstone identification are described herein. According to an embodiment, a mobile gemstone identification system (100) includes a gemstone holder (104, 202, 302, 402) to hold a gemstone (102) and includes an optoelectronic assembly (106). The optoelectronic assembly (106) includes an illumination device (108) to illuminate the gemstone (102) by causing radiations to be incident on the gemstone (102). Further, the optoelectronic assembly (106) further includes a screen (110) to form a pattern indicative of an optical response of the gemstone (102), in response to the radiations being incident on the gemstone (102). According to an aspect, the screen (110) is formed as having a plurality of regions (114, 116) having different masses, and the pattern is to be formed substantially on a region (114) having greater mass than other regions (116).

Examples of gemstone verification are described herein. In one example, for processing a gemstone, pre-stored marking coordinates associated with a gemstone ID are obtained, the pre-stored marking coordinates generated during planning phase of the processing. Further, real-time marking coordinates for the gemstone to be processed are also obtained. An identity of the gemstone is verified based on a comparison of the pre-stored marking coordinates with the real-time marking coordinates. Further, information, including cutting parameters, associated with the gemstone ID of the gemstone is retrieved in response to a valid verification of the identity of the gemstone, for processing the gemstone.

A process of determining the type of a diamond of unknown type, said process including the steps of (i) applying a laser input signal to a diamond of unknown type such the NV.sup.− centres or other C centres such that fluorescence is generated from said diamond; (ii) applying a magnetic field to said diamond and applying a variable microwave frequency to said diamond; (iii) acquiring the light intensity of fluorescence as a function of microwave frequency; and (iv) determining the type of the unknown diamond by comparing the light intensity of fluorescence as a function of microwave frequency of (iii) with light intensity versus microwave frequency characteristics diamond of known of a plurality of diamonds known types.

The present invention includes a spectroscope for gem identification and a fixing device to connect the spectroscope and an auxiliary image sensor. The functional compartments of the spectroscope concerning the present invention include a tube, an incident window, a slit, lens, a newly designed grism, and an exit window; there are two different kind of fixing device designed to fulfill its purpose, one is a clamp, the other is a shell.