Experimental Study on Heat Treatment of Semitranslucent-opaque Sapphire from Chanthaburi, Thailand
Chanthaburi, eastern Thailand, is one of the world-renowned gemstones producers. It is designated as a “City of Gems” as most of the world’s gemstones pass through the city.
The Study on CVD Synthetic Diamond from Various Producers
In the past decade, the diamond industry has faced the new challenge of the synthetic diamond (aka Lab-grown Diamond) commercially available as gem grade and becoming a new natural diamond
Gemmological and chemical characteristics of Yiqisong peridot, Jilin, People Republic of China
The significant deposit of gem-quality peridot has been found in the area called Yiqisong, Yanbian of Jilin province. At first glance, these peridots strikingly show a medium toned yellowish green attribute with high clarity.