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.
Cleavage System in Pink Diamond
A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.
Letseng’s Unique Diamond Proposition
Explores the history, geology, and current production of this unique source of large diamonds.
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.
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.
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.
Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation (英語)
Proposes a model for trapiche emerald formation based on petrographic, spectroscopic, and chemical examination.
Rare “Star and Cross” Quartz from Brazil
Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.
Origin Determination of Dolomite-Related White Nephrite through IB-LDA
A technique for origin identification based on statistical analysis and LA-ICP-MS spectrometry.
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.
Impregnated and Dyed Turquoise
Natural turquoise has been subjected to dyeing and three types of impregnation.
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.
Books: Treasures from India: Jewels from the Al-Thani Collection
Review of Treasures from India: Jewels from the Al-Thani Collection
by Navina Najat Haidar and Courtney Ann Stewart.
GIAのフィールドジェモロジストと共に、アフリカの隠れた宝石を探す旅路へ
GIAのフィールドジェモロジストと共に、マダガスカル、ケニア、タンザニア、ザンビア、そしてモザンビークの宝石鉱区を訪れましょう。
Trapiche and More...
G&G2015年秋号：トラピッチェ エメラルド、合成ダイヤモンド、大きいダイヤモンドの産出地
G&Gブリーフでは、Gems & Gemology（宝石と宝石学）2015年秋号の内容の概要を紹介しています。
ミャンマーのモゴックでルビー、サファイア、スピネルを探究するGIAフィールドジェモロジスト
GIAのフィールドジェモロジストであるVincent PardieuとAaron Palke博士と共に、モゴックのルビー、サファイア、スピネルの鉱床の地質学調査のために、危険を覚悟で地下深くに足を踏み入れます。
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