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. …

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 …

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 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.

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.

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 …

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 …

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 …

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 …

Opal is considered an October birthstone. Some people think it’s unlucky for anyone born in another month to wear an opal. But that particular superstition comes from a novel written in …