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1. (WO2018122552) IDENTIFICATION OF MOUNTED GEMSTONES

Pub. No.:    WO/2018/122552    International Application No.:    PCT/GB2017/053867
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 22 00:59:59 CET 2017
IPC: G01N 21/87
Applicants: DE BEERS UK LIMITED
Inventors: MCGUINNESS, Colin
LANIGAN, Peter
Title: IDENTIFICATION OF MOUNTED GEMSTONES
Abstract:
There is disclosed a method of identifying a mounted diamond as natural or synthetic. The diamond is irradiated with at least one excitation pulse of ultra-violet radiation. During and/or following the excitation pulse, light emitted by the diamond in at least one time window having a predetermined time relationship relative to the excitation pulse is detected so as to obtain luminescence data. The or each time window is chosen to include luminescence having a decay time characteristic of one or more one or more specific markers in the luminescence properties of the diamond. The method further comprises processing the luminescence data to remove light emitted at wavelengths shorter than a specified wavelength.