- 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 [Experiment]
Opal [Experiment]
- 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 - The #1 Screen Time App
Real Focus in Real-Time Measure and improve your focus day by day, on iPhone, iPad and macOS
- 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 | 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
- 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 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
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