原産地への探究心:ブラジルのクルゼイロ鉱山
GIAフィールドジェモロジストとともに、ブラジルCruzeiro トルマリン鉱山への真の宝石採掘の冒険をご覧ください。 年間に8トンものトルマリンを生産するこの鉱山ほどのスリルを与えてくれるカラーストーン原産地は多くはありません。
オンラインでダイヤモンドを購入するための10のヒント
オンラインでのダイヤモンド購入をお考えですか? 自信を持って「今すぐ購入する」のボタンをクリックするための10のヒントをご紹介しましょう。
Rough Diamond Fragment with a Large Green Cleavage Surface
A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.
Blue Gahnite Inclusions inCat’s-Eye Heliodor
Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.
Thai-Myanmar Petrified Woods
The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.
Unusual Graining Structure in Pink Diamond
A Very Light pink diamond showing a uniform plane of color intersecting with a cone of strain that fit perfectly into a colorless hole is studied at the Carlsbad lab.
Rare “Star and Cross” Quartz from Brazil
Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.
Three Unique Large Natural Pearls from Haliotis (Abalone) Species
Abalone pearls submitted to the New York lab provide insight into the range of colors and shapes this type of mollusk can produce.
Pezzottaite Debuts as the Newest Trapiche Gem Mineral (英語)
A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.
Large Star Emerald
An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.
Assembled Cultured Blister Pearl with an Unusual Component
An assembled mabe pearl contains a fluted object, the function of which is unknown.
Modified Rheinberg Illumination
A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.
A Jadeite Bangle Simulant: Hydrogrossular Garnet
Bangles submitted for identification are found to be not jadeite jade, but hydrogrossular garnet, an unusual choice for this form.

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