Depending on the conditions in which it formed, opal may be transparent, translucent, or opaque, and the background color may be white, black, or nearly any color of the visual spectrum. Opal gemstones are hydrated silica crystals that form over millions of years Explore the vibrant world of gemstones
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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. 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. It's one of those projects that truly feels like the future, giving anyone the power to build.
Opals are a type of mineraloid, which means they lack the crystalline structure of typical minerals Instead, opals are composed of tiny spheres of silica, often arranged in a closely packed and orderly manner What sets opals apart from other gemstones is their remarkable play of color, which is a phenomenon known as “opalescence.”
