This document provides the publication information for Gems & Gemology

This article, from the Spring 1994 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States).

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

This document provides the publication information for Gems & Gemology

ジルコンは化学的に純粋な状態では無色透明ですが、一般的には黄褐色から褐色を呈します。また、赤、青、紫、緑などの色も存在します。高い輝きと分散性を持つため、無色のジルコンは宝飾品においてダイヤモンドの代替品として用いられることもあります。

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The February 2012 discovery of high-quality blue sapphires at Thammannawa near Kataragama in southeastern Sri Lanka has intensified gem mining and exploration in the surrounding area and all over the country.

Transparent rhodonite is considered one of the most difficult of all gems to facet because of its perfect cleavage and brittle, uneven fracture.

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Evaluates a potential method of visually identifying HPHT-treated diamonds using microscopy to observe intense fluorescence at the facet edges and junctions.

An exploration of the distinction between jadeite and omphacite, plus GIA's current policy concerning the definition of these stones.

ガーネットは濃い赤色の宝石としてよく知られていますが、実際には黄色、オレンジ色、緑色、茶色など、青色以外のあらゆる色があります。

Edward Gübelin博士によって集められたコレクションの中には、世界中の産地からの珍しい宝石が多数あります。

This document provides the publication information for Gems & Gemology