An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

S.K. Samuel著 Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present（ビルマのインペリアル ジェードとインドの羊脂玉：採鉱と売買、古代から現代までの用途）の書評

S.K. Samuel著 Imperial Jade of Burma and Mutton-Fat Jade of India: Mining, Trade, and Use from Antiquity to the Present（ビルマのインペリアル ジェードとインドの羊脂玉：採鉱と売買、古代から現代までの用途）の書評

Trace-element analysis is used to identify metamictization, treatment, and growth conditions of zircon.

This large marble-hosted occurrence in the Pamir Mountains is a potentially productive source of corundum, including ruby with a bright red color reminiscent of “pigeon’s blood” Burmese rubies.

Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.

Diffusion treatment is used to induce color and asterism in a colorless synthetic sapphire.

Advances in pearl culturing are seen in a parcel of specimens from Strombus gigas gastropods.

An insider’s view of the stunning world of inclusions.

An update on the nephrite jade market from the 2015 GJX show.

A musgravite specimen’s inclusions result in an optical phenomenon unusual for the material.

An unusual parti-color tourmaline necklace and clasp are seen at the 2015 AGTA show in Tucson.