Opal - Wikipedia For use in jewellery, most opal is cut and polished to form a cabochon, a convex shape that maximises the viewing angles through which an opal's play of colour can be observed "Natural" opal refers to polished stones consisting wholly of precious opal
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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 Gemstone | Opal Stone – GIA Opal is the product of seasonal rains that drenched dry ground in regions such as Australia’s semi-desert “Outback ” It is known for its unique display of flashing rainbow colors
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 - 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
Opal - Gemological Institute of America An opal might show a single color, two or three colors, or all the colors of the rainbow! The best play-of-color is the brightest; if it also has all the rainbow colors, then it is very rare and valuable