A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones.

Mar 5, 2025 · Explore the vibrant world of gemstones! Learn about the different types of opal and where to find them in our comprehensive guide.

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.

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.

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.

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 …

May 22, 2017 · Learn about all the different opal types and meanings in this comprehensive guide, plus how to classify them by color, inclusions, formation, origin, and more.

Jun 20, 2019 · Opals are a unique and mesmerizing gemstone known for their distinctive play of color, making them one of the most sought-after and mysterious gemstones in the world. In …

Opals, as a mineral, are comprised of SiO₂ (or silica) with a high percentage of water. Opal is actually amorphous, like glass, rather than a true crystal. It’s a common find in nature. Opal is …

Oct 1, 2025 · With a rainbow of hues seemingly trapped within, Opal is one of the most colourful of the gems. So, let's find out more about this fascinating beauty.