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Reply To: Colour Change Sapphire

#200364
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sydp
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Thank you all for your comments,
When I was undertaking the GEM A Diploma and preparing my student project on colour change gemstones, I believe I read this from an article of the Gemmological Institute of America that if there is a 20% shift in colour/hue then it is deemed to be a colour change gemstone.

once again thanks for the comments


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