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Turquoise
Azure sky, robin’s egg blue: Vivid shades of turquoise define the color that’s named after this gem.
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Turquoise from Western Arkansas
A report on turquoise from the only known U.S. deposit outside of the Southwest.
“Boldly Go” with a Southwest-Inspired Starship Enterprise
An eye-catching replica from a cult TV favorite is found in Tucson.
Golden Rutilated Quartz Artisanal Mining Community
Plans to develop a collective in a remote Brazilian rutilated quartz mining community are unveiled.
Impregnated and Dyed Turquoise
Natural turquoise has been subjected to dyeing and three types of impregnation.
Turquoise with Fingerprint Pattern
A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
Turquoise from Zhushan County, Hubei Province, China
A relatively new source of gem-quality turquoise is hosted within slates in Zhushan County of China’s Hubei Province.
Summer 2009 G&G Lab Notes
This section, from the Summer 2009 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
The Identification of Zachery-Treated Turquoise
Over the last 10 years, millions of carats of turquoise have been enhanced by a proprietary process called the Zachery treatment.
Summer 1986 G&G Lab Notes
This section, from the Summer 1986 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
A Survey of the Gemstone Resources of China
China has identified many deposits with significant potential to produce gemstones; various species are discussed.
Turquoise Planet Earth
A sphere of Armenian turquoise with natural brown matrix material mimics planet Earth.
Polymer-Impregnated Turquoise
A large “Persian” turquoise cabochon was impregnated with a material that was also present in cavities on its base.
