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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.
オパール説明
オパールは、遊色効果と呼ばれる独特の虹色の輝きで知られています。オパールは大きく分けてプレシャスオパールとコモンオパールの2種類に分類されます。プレシャスオパールは遊色効果を示しますが、コモンオパールは示しません。
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。
Snowflakes in Opal
An Opal-Calcite Composite
Gem Testing lab in Jaipur, India recently examined a white-brown, translucent to opaque oval cabochon that turned out to be a composite featuring an unusual combination of gem materials.
Winter 2011 G&G Lab Notes
This section, from the Winter 2011 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
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