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 …

Aug 16, 2025 · Opal forms here through a fascinating natural process. When water containing silica seeps into cracks and voids in rocks, it begins to evaporate, leaving behind tiny silica spheres. Over …

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.

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 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.

Feb 7, 2025 · Opals come in a variety of hues and types, each with its own geological formation process and cultural significance. In this article, we will explore the science behind opal formation, its different …

2 days ago · The world's largest precious opal, by the way, was found right at the Royal Peacock Mine [citation:1]. Not too shabby for a domestic find! The Contenders: Opal Hotspots from Coast to …

Aug 28, 2021 · Opals are a hydrated silica gemstone seen in a stunning array of vibrant colors and patterns. Learn why no two opal gemstones are the same, and the meaning, history, and details that …

Aug 11, 2021 · Opal gemstones are hydrated silica crystals that form over millions of years. Learn about opal details, including stone meanings and symbolism, history, pricing, and value.

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 …