EGL Canada - "A Gemological Study of A Collection of Chameleon Diamonds"

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"A Gemological Study of A Collection of Chameleon Diamonds"

by Thomas Hainschwang, Dusan Simic, Enmmanual Fritsch, Branko Deljanin, Sharrie Woodring, and Nicholas DelRe

Gems & Gemology, Spring 2005
The rarity of chameleon diamonds and their interest for the connoisseur are due to their unusual ability to change color temporarily when heated to about 150°C, or after prolonged storage in the dark. The stable color shown by chameleon diamonds is typically grayish yellowish green to grayish greenish yellow ("olive"), while the unstable hue is generally a more intense brownish or orangey yellow to yellow.

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