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Spectroscopic methods for the identification of natural yellow gem-quality diamonds

GCAL (Gem Certification & Assurance Lab), 580 Fifth Avenue LL05, New York, NY 10036, USA

^* Corresponding author, e-mail: ltret{at}gemfacts.com

The present study shows how spectroscopic methods are implemented during the identification of diamonds. Specifically, this article presents the characteristic spectroscopic features and criteria of identification for different types of yellow diamonds, including varieties of naturally occurring yellow color and varieties of artificially produced yellow color. Due to the numerous causes of yellow color in diamonds, yellow diamonds are ideal for illustrating the value of spectroscopic methods for identification. The spectroscopic techniques discussed include infrared (IR) spectroscopy, optical absorption spectroscopy, and most importantly laser-induced photoluminescence (PL) spectroscopy.

Key-words: diamond, treated diamonds, IR spectroscopy, optical absorption spectroscopy, photoluminescence (PL) spectroscopy.