Spinel from Sri Lanka – An update
Gamini Zoysa, Dietmar Schwarz, Arunas Kleismantas
Challenges in the Detection of Ruby and Sapphire Treatment in the Thai Market
The detection of treatments in ruby and sapphire remains a critical aspect and has become an increas
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reaso