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 …
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 - The #1 Screen Time App
Real Focus in Real-Time. Measure and improve your focus day by day, on iPhone, iPad and macOS.
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
Nov 27, 2025 · 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 …
Opal [Experiment]
Opal [Experiment]
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 …
Opal Gems: Value, Price, and Jewelry Information - IGS
Jul 10, 2025 · Opal gems are so unique you’ll need a special vocabulary to describe them. Learn all about the many opal varieties and how to evaluate them.
Opal: The gemstone Opal (precious, fire, black) information and pictures
Detailed gem and jewelry information guide about the gemstone opal, including black, white, boulder, and precious.
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.