Celebrating 50 Years of Tsavorite
An exhibit at the 2017 AGTA Tucson Gem Fair celebrates the work of Campbell Bridges.
Two Natural Type IIa Diamonds with Strong Phosphorescence and Ni-Related Defects
Natural diamonds exhibit characteristics normally seen in synthetic material.
Filled Pearl with Surface Features
A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
Coated Beryl Imitating Emerald
Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.
Synthetic Moissanite Imitating Rough Diamond
A light green specimen, submitted as a rough diamond, is actually a synthetic moissanite.
Cat’s-Eye Alexandrite with Unique Inclusion Pattern
Examination of a chatoyant alexandrite cabochon.
Wollastonite Blizzard Within Glass
Beads believed to be synthetic quartz are discovered to be glass with a surprising set of inclusions.
New Phenomenal Feldspar from North Carolina with Iridescent Inclusions
A deposit in North Carolina yields potassium feldspar with a phenomenon similar to Australian rainbow lattice sunstone.
Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards
Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.
Two Unusual Natural Sapphires with Synthetic Ruby Overgrowth
For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.
Real-Time Microradiography of Pearls: A Comparison Between Detectors
Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
宝石の巨匠: Drehers家と素晴らしい彫刻 (英語)
A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.
The World’s Biggest Diamonds: Windows into the Earth’s Deep Mantle
An overview of the Winter 2017 Gems & Gemology content.
Data Supplement
Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Chart: Inclusions in Natural, Synthetic, and Treated Ruby
Provides a visual guide to the internal features of natural, synthetic, and treated rubies.
オーストラリア東部のアコヤ真珠養殖業 (英語)
Characterizes the akoya cultured pearls produced on the eastern shoreline of Australia using native Pinctada imbricate fucata mollusks.
Preliminary Observations on Facet-Grade Ruby from Longido, Tanzania
Microscopic observation and trace element analysis is performed on rubies from Longido.
ツーソンで育った愛: GIA同窓会パーティーで地質学者とデザイナーに訪れた「信じられない幸運」
ツーソンで行われたGIA同窓会パーティーに出席するために並んでいた男女が、永遠に人生を変えるチャンスに巡り合いました。
Katzenbach Designs、2年間でAGTAより2回受賞
GIAを卒業したデザイナーが、米国メイン州で産出されたトルマリン、精密なファセッティング、ファンタジーカットの宝石やカスタムデザインのジュエリーに注力します。
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