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- Amethyst Gemstone | Amethyst Stone - GIA
Amethyst Gemstone is the purple variety of the Quartz mineral Amethyst’s purple color can range from a light lilac to a deep, intense royal purple, and from brownish to vivid
- Amethyst History and Lore - GIA
Fine amethysts have been set in religious jewelry and royal crown jewels for ages It was once considered equal in value to ruby, emerald, and sapphire
- Amethyst - Gemological Institute of America
Amethyst is a gem with purple coloring that many people find very beautiful It is the purple variety of the mineral quartz It was as valuable as ruby and emerald until the 1800s when more amethyst was found in the country of Brazil It is the most valuable quartz gem Today, many kinds of jewelry are made from amethyst
- Amethyst Description - GIA
Amethyst Description This amethyst crystal is from Namibia It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top Courtesy Daniel Trinchillo, Fine Minerals International Amethyst is the purple variety of the quartz mineral species
- 紫水晶 | 紫水晶 - GIA
Amethyst from Boudi, Morocco Fabrizio Troilo, Abdelghani El Harfi, Salahaddine Mouaddib, Erica Bittarello, and Emanuele Costa , 四月 30, 2015 阅读详细内容（英语） 摩洛哥紫水晶：采矿和营销 Andrew Lucas and Tao Hsu , 五月 8, 2017 阅读详细内容（英语） Large Aqueous Primary Fluid Inclusion in Amethyst
- アメシストの宝石 | アメシストストーン - GIA
モロッコ産アメシスト: 採鉱とマーケティング Andrew Lucas and Tao Hsu , 5 8, 2017 英語で詳細を読む Large Aqueous Primary Fluid Inclusion in Amethyst Ziyin Sun and Jonathan Muyal , 11 7, 2016 英語で詳細を読む すべてのリサーチを表示 今月の 注目の宝石 宝石百科事典を見る
- Amethyst Quality Factors - GIA
Amethyst’s color quality ranges from extremely pale to intense or very dark - ©GIA and Tino Hammid Any brownish or bronze-colored tints in an amethyst’s purple color, or any noticeable color zoning, lower its value dramatically Buyers of loose amethysts view color zoning by placing the gems table-down against a white background
- GIA Gem Encyclopedia | Complete List Of Gemstones
GIA’s Guide to Gemstones: Gem Encyclopedia GIA’s Gem Encyclopedia is a virtual journey through the science and lore of gemstones from across the globe Each precious stone page features additional detailed gemological information, a buyer’s guide, photos, videos research
- 紫水晶描述 - GIA
这颗紫水晶产自 Namibia（纳米比亚）。 它为典型的水晶晶体：顶部为金字塔状的六面柱状晶体。 由 Fine Minerals International（精细矿产国际）的 Daniel Trinchillo（丹尼尔·特林赤罗）友情提供 紫水晶是石英矿物的紫色类别。 一提到
- Amethyst from Newfoundland, Canada: Geology, Internal Features, and . . .
Amethyst is interpreted to have formed as the final stage of hydrothermal mineral deposition in the veins Variable color, zoning, and crystal size in different but contiguous crystal-lined pockets suggest relatively closed-system behavior within pockets where amethyst quartz was deposited from trapped silica- and iron-bearing hydrothermal fluid
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