- 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
- 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 - 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
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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 | 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: Origins, Types, and Buying Guide | Tianyu gems
Primarily sourced from Australia, particularly Coober Pedy and South Australia, white opal is more abundant than black opal, making it a more affordable yet equally captivating option Its value depends on the brightness and vibrancy of its play-of-color, as well as the clarity and cut of the stone
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