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Separation of natural from laboratory-grown diamond using time-gated luminescence imaging

McGuinness, Colin D., Wassell, Amber M., Lanigan, Peter M.P. and Lynch, Stephen A. 2020. Separation of natural from laboratory-grown diamond using time-gated luminescence imaging. Gems & Gemmology 56 (2) , pp. 220-229. 10.5741/GEMS.56.2.220

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Abstract

A technique that expands on the surface luminescence imaging used in the DiamondView instrument has been developed at De Beers Group Technology, Maidenhead, UK. This provides an additional level of imaging information by way of separating prompt and delayed surface luminescence. The technique has the added benefit of quickly and easily distinguishing colorless or near-colorless natural diamond from laboratory-grown diamond. It can be applied when the identification of natural diamond is required in the study of single stones, multiples in batches, set jewelry, or in a fully automated process. The prompt and delayed luminescence characteristics of natural diamond are compared with a range of chemical vapor deposition (CVD) and high-pressure, high-temperature (HPHT) synthetic diamonds. Of significant interest are some of the less common CVD synthetic samples that have been observed in recent years. This article will summarize the luminescence observed in different diamond types, discuss its spectral characteristics, and serve as a useful reference when interpreting such luminescence images.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Gemological Institute of America
Date of First Compliant Deposit: 27 August 2020
Date of Acceptance: 29 July 2020
Last Modified: 05 Aug 2022 01:38
URI: https://orca.cardiff.ac.uk/id/eprint/134539

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