Novel cultured pearls with ceramic nucleus and possible cause of their strong luster
Yan Li, Qing Su
Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities
In this study, first results of trace element analyses and various spectrometric investigations on p
Bertrandite in Emeralds
Over the past few years we have been seeing more and more lower quality stones in the lab. The reaso