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 Description - GIA
Amethyst’s purple color can range from a light lilac to a deep, intense royal purple, and from brownish to vivid. Amethyst also commonly shows what is called color zoning, which in the …
Amethyst Quality Factors - GIA
The finest amethyst color is a strong reddish purple or purple with no visible color zoning. Dealers prefer strongly saturated reddish purple to dark purple, as long as the stone is not so dark that …
Amethyst from Boudi, Morocco | Gems & Gemology - GIA
Aug 3, 2015 · The purple coloration of amethyst is caused by the presence of an interstitial Fe 4+ color center in the quartz (Rossman, 1994), combined with irradiation from natural gamma-ray …
February Birthstone | Amethyst Birthstone Source & Meaning - GIA
If you were born in February, your birthstone is amethyst – the purple variety of quartz that has captivated mankind for millennia. Its lilac to deep purple hues can be cut into many shapes …
Amethyst From Morocco: An Update | Gems & Gemology - GIA
A closer view of the amethyst shows alternating bands of darker and lighter purple color zoning. Photo by Charuwan Khowpong; magnified 10×. Common characteristic internal features were …
Four Peaks amethyst crystals show great variabil-ity in the distribution and quality of color, which can range from light to dark purple and includes some purplish red material. Most crystals …
GIA Gem Encyclopedia | Complete List Of Gemstones
Ametrine, one of the rarest types of transparent quartz, combines two colors: amethyst’s purple and citrine’s orange-to-yellow, growing together in a single crystal. More About this Gem …
Moroccan Amethyst: Mining and Marketing | Gems & Gemology
Apr 30, 2015 · Morocco produces deep purple amethyst with red hematite “finger” inclusions that can cause red flashes of color. Photo by Eric Welch/GIA, courtesy of Geostone Group. …
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 …