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Device and method for screening gemstones

Through the optical fiber probe technology coupled with the LED light source and filter, combined with the computer device, the accurate identification of natural gems and synthetic gems is achieved, which solves the problem of distinguishing natural and synthetic gems in the existing technology and improves the efficiency of gem screening. Accuracy and efficiency.

Pending Publication Date: 2019-11-01
GEMOLOGICAL INSTITUTE OF AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices suffer from many drawbacks such as high false alarm rate, limited sensor dynamic range, limited sample size and cutting range, inability to analyze mounted diamonds, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0133] Exemplary N 3 analyze

[0134] Figure 7A shows an exemplary N3 fluorescence spectrum of natural diamond. Here, three peaks were identified between 410 nm and 450 nm. Extract selected data from each peak to compute features that will represent the peak.

[0135] For example, for each of the three peaks shown in Figure 7A, a peak intensity value and a reference intensity value are determined. The ratio of peak to reference is then calculated. In the example shown in Figure 7A, the peak intensity at 415.6 nm is the most representative. N3 has a zero phonon line at 415.6 nm at room temperature, and the analysis disclosed herein is to confirm this peak and its opposite side peak. This ratio analysis is just one of many ways to achieve peak analysis. In some embodiments, the peak at 415.6 nm is used because this peak position is very stable at room temperature.

[0136] As disclosed herein, multiple spectra can be collected to determine the ratios of multiple peaks and...

example 2

[0139] Colorless Diamond Analysis

[0140] Fig. 8 shows the analysis results of colorless diamond. The current method (using N 3 analysis) could correctly identify 97% of natural diamonds out of 1660 natural diamonds and 1077 synthetic rice diamonds tested.

[0141] An additional 2% of natural diamonds were further identified based on their fluorescence spectra; for example, synthetic diamonds and diamond imitations could be detected with 100% accuracy based on the central bandwidth of the fluorescence spectra (eg, FIG. 7B ).

[0142] In Figure 8, on the right, the emission or brightness curves of natural source diamonds are compared with those of typical synthetic diamonds. The curves depict fluorescence emission in the visible range from just above 400 nm (determined by long pass filter) to about 750 nm, covering the color spectrum from violet to red. As shown, synthetic diamond exhibits no observable emission over the detection range when exposed to a UV light source. D...

example 3

[0144] Pink Diamond Analysis

[0145] Different types of treatments, such as high temperature and high pressure (HPHT), irradiation and / or annealing, have been used to enhance the color appearance of pink diamond. However, after the process, it also amplifies or introduces some features that are very rarely found in natural untreated pink diamonds. Figure 9 illustrates the pink diamond analysis results by comparing the spectral characteristics of natural pink diamond and treated pink diamond. In this example, characteristic fluorescence can be used to identify pink colored diamonds that have been treated by temperature or pressure treatment. The top spectrum is the fluorescence curve of natural pink diamond, while the bottom curve shows the fluorescence spectrum of treated pink diamond. It is worth noting that natural pink diamond does not show significant emission beyond 540 nm (especially after 560 nm or 580 nm).

[0146] Treated pink diamond exhibits considerable emissio...

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Abstract

Disclosed herein are devices and methods for screening gemstones (e.g., diamonds). In articular, the disclosed method and system can efficiently and accurately identify and distinguish genuine earth-mined gemstones (e.g., diamond) from synthetic and treated gemstones or gemstone simulants.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 435,045, entitled "Device and Method for Screening Gemstones," filed December 15, 2016, which is hereby incorporated by reference in its entirety Incorporated into this article. technical field [0003] The disclosed devices, systems and methods relate to the field of gemstone authentication. In particular, the devices, systems and methods relate to how genuine earth mined gemstones can be distinguished from artificially grown gemstones. Gemstones suitable for the present analysis include, but are not limited to, colorless natural diamonds, pink diamonds, other natural diamonds, non-diamond materials such as corundum (ruby, sapphire), emerald, zoisite, and spinel. Background technique [0004] Man-made gemstones are becoming more common in the market; for example, synthetic diamonds obtained using high-pressure high-temperature (HPHT) meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64A44C17/00A44C19/00G01N21/87G01N33/38G09B5/02
CPCG01N21/6489G01N21/645G01N21/87G01N2021/6484G01N2021/6471G01J2003/2843
Owner GEMOLOGICAL INSTITUTE OF AMERICA INC
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