Opal - Wikipedia The internal structure of precious opal causes it to diffract light, resulting in play-of-color 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 Gemstone | Opal Stone – GIA Opal is an October birthstone Grids of silica spheres 0 2 microns in size create red play-of-color flashes Opal contains up to 20% water trapped in its silica structure The novel “Anne of Geierstein” gave opal a reputation of being unlucky
Pictures of Opal - Black, Fire, Boulder, Blue and Pink 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 | Properties, Types Uses | Britannica 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
Opal Gemstone Information: Varieties, Colors, Care, and More Explore comprehensive opal gemstone information covering varieties like black, fire, and boulder opals, their colors and patterns, historical significance, care tips, and symbolic meanings for enthusiasts and buyers
Opal - International Colored Gemstone Association October’s birthstone, opal is a gem of positive transformation, revealing the colorful attributes of those who wear it Magical, mysterious, and lively—opal is captivating new admirers with its variety