- 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
- 14 Different Types Of Opal And What They All Look Like
Explore the vibrant world of gemstones! Learn about the different types of opal and where to find them in our comprehensive guide
- Opal Gems: Value, Price, and Jewelry Information - IGS
Opal is an amorphous form of silica, chemically similar to quartz, but containing 3% to 21% water within its mineral structure Gem grade opals usually have 6% to 10% water content
- 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 | 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 - 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
- Opal
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