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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.
Preview of Nature Art Science with Paula Crevoshay
Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.
Snowflakes in Opal
Jewelry Television in Tucson
A look at JTV’s history, current activities, and impact on the industry.
Written Characters in Black Opal
Play-of-color patches in black opal display interesting written character patterns.
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.
Chrysoprase and Prase Opal from Haneti, Central Tanzania
Commercial quantities of gem-quality chrysoprase and green prase opal (nickel-bearing chalcedony and common opal, respectively) have been recovered from altered serpentinite deposits near Haneti, Tanzania.
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.
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。
.jpg "YMAL GIA Ed")
