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クイーンズランド州のボルダーオパール (英語)
After almost 75 years of inactivity, the deposits of boulder opal in Queensland, Australia, began to attract new interest in the 1960s and 1970s.
Treated Andamooka Matrix Opal
Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly color enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia.
"Opalite": Plastic Imitation Opal with True Play-Of-Color
A plastic imitation opal that shows true play-of-color was advertised as
Opals from Opal Butte, Oregon
Recent mining at Opal Butte in northeastern Oregon has produced a wide variety of large flawless opals.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.
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.
Abstracts; Winter 1991
Gems & Gemology（宝石と宝石学）の1991年冬号から抜粋したこの記事は、Gems & Gemology（宝石と宝石学）以外で公開された重要な宝石学関連記事を要約したものです。
Unusual Bodycolors ofPrecious Opal
Two stones with unusual bodycolor are identified as precious opal.
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