FeatureGems & Gemology, Winter 2020, Vol. 56, No. 4

Low-Temperature Heat Treatment of Pink Sapphires from Ilakaka, Madagascar

Sudarat Saeseaw, Charuwan Khowpong, Wim Vertriest

Ms. Saeseaw is senior manager of colored stone identification, Ms. Khowpong is an analytics technician, and Mr. Vertriest is super­visor of field gemology, at GIA in Bangkok.

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Low-Temperature Heat Treatment of Pink Sapphires from Ilakaka, Madagascar | Gems & Gemology