Spinel from Sri Lanka – An update
Gamini Zoysa, Dietmar Schwarz, Arunas Kleismantas
Pink to Red and Violet Diamonds from the Argyle Mine, Australia: Properties, Color Origin and Latest Research Results
The Argyle Mine was by very far the largest producer of pink to red diamonds worldwide and the only
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reaso
