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Byline: Somporn Thapanachai
Sep. 3--Thai gem traders and the Gem and Jewellery Institute of Thailand have agreed on the certification process for orange and orange-pink sapphires produced by Thai gem-burners.
Gem traders in Chanthaburi recently invented a new technique to transform the colour of Madagascan sapphires from pink to orange pink -- a rare colour of high-value stones known as padparadschas which originated in Sri Lanka.
Earlier this year, American jewellery traders were sceptical about the colour transformation process, giving rise to a problem in world gem markets on how to classify the stones. Thai traders, meanwhile, insisted that ...
Source: HighBeam Research, Solution Offered in Dispute on Gem Stone Treatment in Thailand.