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Learn about opal, the October birthstone that displays all the colors of the rainbow. Explore its formation, interaction with light, quality factors, treatments, synthetics, and more from GIA, the world's foremost authority on gems.
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals.
- Amorphous
- Mineraloid
- Opl
Learn about opal's unique properties, types, and history from the International Gem Society. Find out how to evaluate, care for, and enjoy opal jewelry.
Learn about opal, a popular and colorful gemstone with a unique play-of-color phenomenon. See pictures of different types of opal, such as precious, fire, boulder, black, and common opal, and find out where they are mined.
11 de ago. de 2021 · Opal is a gemstone that forms in a variety of different colors, shapes, and sizes. Unlike most gemstones, opal isn't a mineral but a mineraloid. The composition is a hydrated (wet) amorphous silica with a Mohs hardness scale ranking between 5.0 to 6.5.
1 de out. de 2023 · Learn about the history, science and varieties of Opal, the 'queen of gems' that changes colour like a rainbow. Discover how Opal was valued, traded and mined across the world, from ancient times to the present day.
Opal is generally seen as a healing stone that symbolizes inspiration, confidence, and emotional healing. If you’re itching to try opal’s spiritual benefits, follow along to learn what makes a good-quality opal gemstone before you buy your own!
