A look at JTV’s history, current activities, and impact on the industry.

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.

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。

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

This article describes a new type of synthetic fire opal marketed as “Mexifire.”

This section, from the Summer 1981 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.