Atypical “Beading” in the Production of Cultured Pearls from Australian Pinctada maxima
In 2011, the authors began to see cases of low-quality natural pearls being used as unconventional “beads” for cultured nacre growth.
夢を追いかける「ヒッピー」のデザイナー兼鑑定士、地元の同窓支部に新たな活気を与える
GGであるRebecca Buysは、デザイナーと鑑定士としての充実したキャリアを築き上げ、カリフォルニア州サンディエゴのGIA同窓生を指導します。
Cuprian Liddicoatite Tourmaline
Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.
“Decorated” Jadeite Jade in the Chinese Market
An examination of jadeite decorated with smaller jadeite ornaments.
Blue HPHT Synthetic Diamond Over 10 Carats
Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.
CVD Synthetic Diamond Over 5 Carats Identified by GIA
Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.
Trapiche-Type Sapphire from Tasmania (英語)
A rare Tasmanian trapiche-type sapphire, found during a field expedition, is examined.
A New Find of Danburite in the Luc Yen Mining Area, Vietnam
Reports on a recently discovered eluvial deposit of honey yellow danburite with excellent transparency.
Synthetic Emeralds Grown by Richard Nacken in the Mid-1920s
Describes the chemical, morphological, and microscopic properties of the first gem-quality synthetic emeralds ever produced, offering a historical perspective on their development.
Quarterly Crystal:Growth Features on Titanite
Dramatic growth features are found on the surface of a titanite specimen from Russia.
Turquoise with Simulated Matrix
A turquoise bead is found to have an artificial pyrite and resin matrix.
Synthetic Sapphire and Synthetic Spinel Doublets
Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.
Update on Spectroscopy of “Gold Sheen” Sapphires
The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.
Chart: Inclusions in Natural, Synthetic, and Treated Emerald
Provides a visual guide to the internal features of natural, synthetic, and treated emeralds.
Apatite Cluster in Orthoclase Feldspar
An apatite crystal cluster, notable for its morphology and size, is found in a feldspar specimen.
Update on Gemstone Mining in Northern Mozambique
Recounts an expedition to Mozambique’s important deposits of ruby, spinel, and tourmaline, which have yet to be fully explored.
Jaipur, India: The Global Gem and Jewelry Power of the Pink City
Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.
Exhibition Review: Illuminations, from Earth to Jewel (英語)
A review of Illuminations, from Earth to Jewel, at the Museum of Mineralogy at the ParisTech School of Mines in France.
クイーンズランド州のオパールフィールド：独特なオーストラリアのボルダーオパールの産地
ボルダーオパールの人気は、ますます高まっています。 オーストラリアのクイーンズランド州中央部では、十数か所以上からこの石が生産されています。 このユニークな宝石つついて詳しくGIAのフィールドジェモロジストと一緒に探りましょう。
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