Morganite Care and Cleaning

Learn about morganite's durability and how to care for your morganite jewelry.

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Moonstone Quality Factors

Learn about the factors that make moonstone so desirable.

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Book Review: Diamonds: An Early History of the King of Gems

A review of Diamonds: An Early History of the King of Gems by Jack Ogden.

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Book Review: Figures & Faces: The Art of Jewelry

Review of Figures & Faces: The Art of Jewelry by Patrick Mauriès and Évelyne Possémé

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Book Review: Geology: A Very Short Introduction

Review of Geology: A Very Short Introduction by Jan Zalasiewicz.

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Book Review: Masterpieces in Miniature: Engraved Gems from Prehistory to the Present

Review of Masterpieces in Miniature: Engraved Gems from Prehistory to the Present by John Boardman and Claudia Wagner.

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Book Review: Symphony of Jewels: Anna Hu Opus 2

Review of Symphony of Jewels: Anna Hu Opus 2 by Janet Zapata with Sarah Davis.

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Rose Quartz Quality Factors

Learn about the factors that make rose quartz so desirable.

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Rose Quartz History and Lore

Rose quartz jewelry was known to be crafted by the Assyrians around 800-600 BC. The Assyrians, along with the Romans, might have been the first to use this stone.

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Rose Quartz Description

Rose quartz is one of the many quartz varieties used as a gem material. It gets its name from its delicate pink color, which ranges from very light (almost white) to medium-dark.

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Sunstone Quality Factors

Learn about the factors that make sunstone so desirable.

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Sunstone History and Lore

In the early 1800s sunstone was a little-known, rare, and costly gemstone. It wasn’t until finds in Norway, Siberia, and other parts of the world that sunstone became somewhat more widely recognized, more available, and less expensive.

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Sunstone Description

Not all feldspars that bear the name “sunstone” are from the same side of the feldspar family—both the orthoclase and the plagioclase species boast a sunstone feldspar variety. The name sunstone refers to the gem’s appearance rather than to its chemical makeup.

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Iolite Description

This silicate of aluminum, iron, and magnesium has two distinctive features—a beautiful, violetish blue through slightly violetish blue hue derived from iron and a striking, eye-visible pleochroism.

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Iolite History and Lore

Iolite has a long history of use as an adornment and possibly as a navigation tool.

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Jade Description

Modern gemologists use the word “jade” as a generic term for both nephrite and jadeite. These minerals have been linked throughout history.

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曼谷校区疫情信息更新

学生、教师和员工的安全对 GIA 至关重要,我们正在按照政府的建议和程序重新开放教室,确保安全。

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在消费者的新期望中拥抱可持续发展

莅临 JCK 拉斯维加斯珠宝展上 GIA 主办的午餐会,聆听就可持续发展主题的专家组讨论,宝石和珠宝行业的领导者将出席该活动。随着消费者预期不断提高,这一重要议题不容错过。

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关于 GIA 仪器

介绍了 GIA 销售的仪器

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链接到 GIA

美国宝石研究院 (GIA) 提供领先的宝石和珠宝知识、标准、教育,尽可能地为公众提供教育服务是我们的使命之一。欢迎直接链接到我们的网站。我们提供若干个按钮,以供您直接链接到 GIA.edu 或 GIA Gem Encyclopedia(美国宝石研究院 (GIA) 宝石百科全书),同时也为您的网站添加了悦目的视觉元素。

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