Sapphires from Northern Ethiopia
A new source of sapphires is found in the Tigray region of Ethiopia.
Carbonado Diamond: A Review of Properties and Origin
Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.
Chlorapatite in Quartz
A dichroic inclusion within a quartz crystal is found to be chlorapatite.
A Study of Rubies from Cambodia and Thailand
A report from the GIA Laboratory in Bangkok analyzing 41 Cambodian-Thai rubies.
Book Review: Ruby & Sapphire: A Gemologist’s Guide
Review of Ruby & Sapphire: A Gemologist’s Guide
Continuity and Change in Chinese Freshwater Pearl Culture
Farmers have experimented with bead nucleation, but until recently the methods tried did not produce the quantity or quality necessary for economic success.
春 2017年オークション更新: これまで最も高価な宝石やその他レコード
2017 オークション シーズン見た 2 つのレコードの重要な価格下落と固体、春上がっていないトップの価格は軒並み宝石します。
2017年のラスベガスショーでの売上高が不安定な中、デザイナーとダイヤモンドが市場を先導
デザイナーは市場のトレンドに対応し, ダイヤモンドの需要は予想よりも好調でした。また、ホリデーシーズンに向けたダイヤモンドのマーケティングキャンペーンでは資金調達の増加が期待されます。
2017 Vegas Outlook: Decent, But Cautious, Buying
Buyers at the 2017 JCK Show will likely stick to their open-to-buy plans, but take few chances on new lines or extra stock. Plus: An overview of retail sales, auction headlines.
アメリカの淡水真珠の魅力: Latendresse 家族を再訪する
John Latendresseは、アメリカの養殖真珠の父として知られています。 また天然真珠のコレクターでもあり、膨大な天然真珠のコレクションを家族に残しています。 Latendresse家は、アメリカの真珠業界ではよく知られた存在で、また長い間GIAの真珠研究を支援してきています。 では一緒に、この家族とその真珠のコレクションを再訪してみましょう。
Causes of Iridescence inNatural Quartz
Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
Brazilian Diamonds: A Historical and Recent Perspective
Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.
Tourmaline and Sapphire from Nigeria
An update on Nigerian colored stone production is obtained at the Tucson gem shows.
New Designs from Paula Crevoshay
World-renowned jewelry artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.
A New Discovery of Emeralds from Ethiopia
A report on a new Ethiopian source of high-quality emerald.
Jewelry Industry Summit
A report from the second Jewelry Industry Summit, held in Tucson, Arizona on January 29–30, 2017.

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