Explore the vibrant world of gemstones Learn about the different types of opal and where to find them in our comprehensive guide. Photos of opal from around the world Guidance for people who want to buy opal, see different types of opal, understand their names, learn about synthetics and imitations. An opal might show a single color, two or three colors, or all the colors of the rainbow If it also has all the rainbow colors, then it is very rare and valuable.
Opal gemstones are hydrated silica crystals that form over millions of years Learn about opal details, including stone meanings and symbolism, history, pricing, and value. Opal, silica mineral extensively used as a gemstone, a submicrocrystalline variety of cristobalite In ancient times opal was included among the noble gems and was ranked second only to emerald by the romans. Learn about all the different opal types and meanings in this comprehensive guide, plus how to classify them by color, inclusions, formation, origin, and more. Opal was long thought to be the most precious of gems because it harboured the colours of many other revered gemstones
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