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. Opal gems are so unique you’ll need a special vocabulary to describe them Learn all about the many opal varieties and how to evaluate them.
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.
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