Recrystallization of Baddeleyite as an Indicator of PHT (“HPHT”) Treatment in Sapphire

Nephrite has a long history and profound culturalsignificance in China, along with a vast consumer market. In July 2025, author YG conducted a field t...

A pink sapphire weighing over 20 ct was recently submitted to Guild Gem Laboratories, and it presented a particularly challenging case for the determi...