Amethyst Gemstone | Amethyst Stone - GIA
WEBIt was believed to prevent intoxication—amethystos means “not drunk” in ancient Greek. Today, as the most valued quartz variety, amethyst is in demand for designer pieces and mass-market jewelry alike, and its purple to pastel hues retain wide consumer appeal. Amethyst Description. Amethyst History and Lore.
Amethyst Description - GIA
WEBAmethyst 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.
Amethyst History and Lore - GIA
WEBAmethyst History and Lore. This ancient necklace dates to 2000BCE. An inscription on the center stone is a South Arabian script from the 8th century BCE. - From "Gems and Gemstones: Timeless Natural Beauty of the Mineral World" by Lance Grande and Allison Augustyn, 2009, University of Chicago Press.
Amethyst - Gemological Institute of America
WEBAmethyst 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.
Amethyst Quality Factors - GIA
WEBAmethyst Quality Factors. This 17.53-carat amethyst displays a rich reddish purple color. - Lydia Dyer, Super Trillion Cut Amethyst gem courtesy of John Dyer & Co. Amethyst has been the most-prized quartz variety for centuries.
紫水晶 | 紫水晶 - GIA
WEB关于紫水晶. 查看图库. 直到 19 世纪在巴西发现大型矿床，紫水晶曾经与红宝石和祖母绿一样昂贵。. 有人认为它可以防止中毒—amethystos 在古希腊语中表示“不醉”之意。. 如今，作为最有价值的石英类别，紫水晶备受设计师作品和同类大众市场珠宝的亲睐，其 ...
Amethyst Care and Cleaning Guide - GIA
WEBUltrasonic cleaners are usually safe except in the rare instances where a stone is dyed or treated by fracture filling. Steam cleaning is not recommended, and amethyst should not be subjected to heat. Learn about amethyst's durability and …
Insights From Inclusions - GIA
WEBSep 29, 2014 · Natural gemstones are typically far more valuable than synthetics, so being able to identify them correctly is a powerful skill. One of the best ways to determine if a gemstone is natural or synthetic is to note the type and variety of its inclusions.
Amethyst Buying Guide - GIA 4Cs
WEBFeb 1, 2014 · Breathtaking and surprisingly affordable, it’s also the most valued variety of quartz. If you’re in the market for this February birthstone, GIA’s Amethyst Buying Guide has tips and advice on what to look for, including amethyst quality factors.
Amethyst from Boudi, Morocco | Gems & Gemology - GIA
WEBAug 3, 2015 · Amethysts from Boudi, Morocco, are characterized by double terminations and hourglass-shaped color zoning. This study provides information about the geology of the deposit, the mining of the material, and its internal and external features. Photos show the amethyst’s strong color zoning.