Issue includes lab notes and gem news from around the world.
By Deepa Narwani
The summer 2012 issue of GIA’s quarterly journal, Gems & Gemology, is now available through a free iPad app.
The issue features articles on at CVD-grown synthetic diamonds from Gemesis Corp. The issue includes criteria for identifying these products. It also gives an overview of recent advances in CVD synthesis, and a study of a synthetic nano-polycrystalline diamond sphere that is completely transparent.
The app further reports on the recent sapphire rush near Kataragama, Sri Lanka, which has yielded specimens with good transparency and a pure blue colour.
An assessment of the emerging cultured pearl industry in the Federated States of Micronesia is also featured.
The issue includes lab notes from GIA about a large artificially irradiated yellow diamond, a new type of greenish blue imitation opal, and near-colourless synthetic diamonds from Advanced Optical Technology Co.
The journal further includes Gem News International reports from around the world. These include news about rainbow moonstone from Zambia and a discovery of ruby and sapphire near Didy, Madagascar.