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Instrument and method for examining gemstone

A gemstone and diamond technology, applied in the field of gemstone inspection, can solve problems such as inability to accurately detect diamonds, and achieve the effect of fast and convenient use.

Inactive Publication Date: 2007-03-14
DE BEERS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It is desirable to provide a device that can be adopted by jewelers so that the instrument requires no skill, is relatively inexpensive, is easy to operate, and is quick to use, but this requires acceptance of the fact that the instrument is not Capable of detecting all types of diamonds with flawless accuracy

Method used

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  • Instrument and method for examining gemstone
  • Instrument and method for examining gemstone
  • Instrument and method for examining gemstone

Examples

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Embodiment Construction

[0042] Instruments of Figures 1 to 6

[0043] In order to provide a self-contained and self-contained instrument, the instrument has a frame 1 as a supporting structure for mounting other components. The frame 1 is open on both sides to provide access for maintenance operations. The frame 1 is covered by a detachable plastic shell 1c (see Figures 5 and 6), which encloses most of the components guilty. The frame 1 includes a cover 1a and a bottom plate 1b screwed to the cover 1a, and most parts are screwed to the bottom plate 1b. An insulated cylindrical (elongated section) thermoplastic thin-walled container or cryogen bath 2 is mounted on top of the frame 1 . The bath 2 is located inside a cylinder 2a made of expanded rigid foam, such as polystyrene, which acts as an insulation. The bath 2 is used to hold the liquid nitrogen 3 and the polished stone 4 to be tested; the bath 2 must be of suitable size to hold the expected largest diamond and a sufficient amount of liquid ni...

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Abstract

The instrument has a housing (1) mounting the following components to provide a self-contained, stand-alone instrument: a compact solid state 532nm laser 9 coupled to a window (5) in a thermally-insulated container (2) for liquid nitrogen and the gemstone (4); a compact solid state diode 655 nm laser (10) coupled to the window (5); two compact, sensitive CCD spectrometers 11 and 11 detecting luminescence features with zero-phonon lines at in the range 550-1000 nm; a processor (17) for processing the signals from the spectrometers 11 and 11 to indicate whether the gemstone (4) is a natural diamond which has not been subjected to irradiation treatment or hgih-pressure high-temperature treatment; and a display (18). The container (2) has a cover (6) and a pin (8) which is used to place and hold the gemstone (4) against the window (5).

Description

technical field [0001] The invention relates to a device for examining gemstones, comprising a thermally insulated container for containing the gemstones and having a window; means for cooling the container using cryogen; a cover for the container; a laser illuminating the gemstone; a spectrometer for detecting the photoluminescence spectrum emitted by the gemstone via said window and giving a corresponding spectral data signal at its output; a blocking filter positioned at the window Between the spectrometer and the spectrometer, for filtering out the radiation of the irradiation ray wavelength; the processor, which is connected to the output terminal of the spectrometer, for analyzing the spectral data from the spectrometer; connected to the processor a display for displaying information about the gemstone; and a support structure. [0002] The invention also relates to a method of examining a gemstone, comprising illuminating the gemstone with a laser, detecting the photol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/87G01N21/64
CPCG01N21/87G01N21/6489
Inventor S·C·劳森
Owner DE BEERS UK LTD
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