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Infrared Analysis of Diamonds

A diamond and infrared absorption technology, which is applied in the analysis of materials, material analysis through optical means, and jewelry testing, can solve problems that are not fast and laborious

Active Publication Date: 2019-04-19
DE BEERS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is laborious and time consuming and requires the depth of knowledge of skilled scientists and technicians (which is not a quick and easy way to convey information)

Method used

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  • Infrared Analysis of Diamonds
  • Infrared Analysis of Diamonds
  • Infrared Analysis of Diamonds

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Embodiment Construction

[0030] Nitrogen is the most prevalent atomic doping found in natural diamonds and is also prevalent in man-made diamonds unless steps are taken to deliberately exclude it. It exists in diamond lattices of various structures and produces absorption in the first-order range of the infrared spectrum. Diamonds that contain measurable proportions of nitrogen are classified as Type I, while those that contain nominally no nitrogen (ie, less than about 10 ppm) are classified as Type II.

[0031] Type I diamonds are further subdivided based on the aggregation state of nitrogen in the crystal lattice. Nitrogen in diamonds is usually present in individual substitution positions (called C-centres, or N S0 ) are classified as Type Ib. Most man-made diamonds are of this type. The concentration of nitrogen in C-concentration can be from the peak at 1130cm -1 The intensity of absorption is determined. The absorption spectrum of such diamonds also includes the 1344cm -1 at the peak. On...

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Abstract

The present invention provides a method for automating the classification of diamond gemstones, providing the infrared absorption spectrum of the gemstones. The properties corresponding to the absorption of water and the intrinsic absorption of the diamond lattice were subtracted from the absorption spectrum. The spectra are analyzed to identify predetermined absorption characteristics corresponding to lattice defects in the diamond. Gemstones are classified according to the strength of predetermined absorption properties. The results of the classification are saved in a database.

Description

technical field [0001] The present invention relates to an automated method for the analysis of diamonds using infrared absorption spectroscopy. Background technique [0002] It is considered extremely important that man-made diamonds sold as gemstones be properly disclosed to avoid confusion and maintain consumer confidence. Due to improvements in man-made methods, and because man-made diamonds have the same intrinsic crystal structure as natural diamonds, it is often extremely difficult or impossible to determine that a stone is man-made just by visual inspection. Furthermore, it has become apparent in recent years that some natural diamonds can be treated, eg, by irradiation and / or annealing, to improve their optical properties. It is also important to disclose when these treatments were applied, but they are also difficult to detect visually. [0003] Several instruments can be used to aid in the identification of natural untreated diamonds, man-made diamonds and treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/35G01N21/3554G01N21/3563G01N21/87
CPCG01N21/35G01N21/3554G01N21/3563G01N21/87G01N2021/3595G01N2201/12
Inventor 费尔达巴德·卡恩尼古拉斯·马修·戴维斯戴维·费希尔詹姆士·戈登·查特斯·史密斯
Owner DE BEERS UK LTD