ジェダイトとオンファサイトとの識別の調査に加えて、これらの石の定義に関するGIAの現在の方針。

Since the 1970s, Brazil has been a consistent source of emerald.

Dye treatments in yellow or “golden” cultured pearls have improved to the point that some samples show little surface evidence.

A presentation of parameters used to support GIA's symmetry grading system.

Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablation.

珍しい鮮やかな紫の実体色と強い遊色効果を持つオパール群の検査。

Opals with an unusual purple bodycolor and strong play-of-color have recently appeared in the market.

A compilation of ongoing research into red feldspar and its sources around the world, as well as the detection of various color treatment processes.

The existence of a natural red andesine deposit in China/Tibet has been the subject of controversy since 2006.

Gem-quality brownish red zircon occurs in alluvium derived from Tertiary alkali basalt at Muling in the northeast Chinese province of Heilongjiang.

Red copper-containing plagioclase feldspar from Oregon has been available for over a century.

Natural-color saltwater cultured pearls from Pinctada margaritifera were studied by diffuse reflectance UV-Vis-NIR spectroscopy.

An important deposit of andradite, containing demantoid and topazolite varieties, has been mined near the village of Antetezambato in northern Madagascar since early 2009.

Pietersite has been described as a brecciated variety of tiger’s-eye.

A 52.49 carat near-round “pearl” is submitted to the Bangkok laboratory as a “Melo pearl.”

An examination of synthetics in the marketplace over the first decade of the 2000s.

宝石・宝飾業界の専門家たちが、2010年10月22日に開催されたGIA（米国宝石学会）主催の第20回年次宝飾品キャリアフェアで、求職者に向けてアドバイスを述べた。