Instrument for examining gemstone

A technology of gems and instruments, applied in the direction of testing jewelry, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problem of inaccurate detection of diamonds, etc., and achieve the effect of fast and convenient use.

Inactive Publication Date: 2003-11-26
DE BEERS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is desirable to provide an instrument that can be adopted by jewelers so that it requires no skilled skill, is relatively inexpensive, is easy to ope...

Method used

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  • Instrument for examining gemstone
  • Instrument for examining gemstone
  • Instrument for examining gemstone

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0025] Embodiments of the invention will now be described by way of example with reference to the accompanying drawings, in which:

[0026] figure 1 Along the way through one of the first instruments used to indicate whether a polished gemstone is an untreated natural diamond figure 2 A partial vertical section view perpendicular to the I-I line;

[0027] figure 2 for figure 1 The plan view of the instrument, the top cover part and some other parts are not shown in the figure;

[0028] image 3 is a perspective view of the sample compartment of the first instrument;

[0029] Figure 4 Perspective view of the sample holder for the first instrument;

[0030] Figure 5 is a perspective view of the housing of the first instrument viewed from the rear side;

[0031] Figure 6 is a perspective view of the first instrument in the housing viewed from the front side;

[0032] Figure 7 is a schematic diagram of a vertical section through the second instrument;

[0033]...

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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

Background of the invention [0001] It is important to be able to determine if a polished gemstone is an untreated natural diamond. Gemstones can be made into diamonds through synthetic methods. Natural diamonds can also be subjected to high pressure high temperature (HPHT) treatment, or to irradiation to increase their value by, for example, enhancing their color. [0002] The present invention relates to an instrument for indicating or determining whether a polished gemstone is a natural diamond that has not been subjected to irradiation treatment and / or whether it is a natural diamond that has not been subjected to high pressure and high temperature treatment. This determination is made in the laboratory by illuminating the stone, causing it to emit a photoluminescence spectrum, and analyzing this spectrum. by Adamas Gemological Laboratory at their web site http: / / www.gis.net / ~adamas / raman.html This process is discussed in a publication entitled "SAS2000 RAMAN Spectra" pu...

Claims

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Application Information

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IPC IPC(8): G01N21/64G01N21/87
CPCG01N21/87
Inventor S·C·劳森
Owner DE BEERS UK LTD
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