Opal Stone – Natural, Cabochon, Colorless

Opals are in a class by themselves. As a species, opal is so unique it has its own descriptive vocabulary. More than any other gem, each opal is distinctly…

Discover America’s best gem hunting locations where you can unearth emeralds, diamonds, sapphires and more! Plan your gemology vacation with…

How can you be sure that a piece of opal for sale is genuine? Learn about the major types of opal simulants and how to distinguish them from the real…

Take a look at the IGS member survey results for opal polishing. You’ll find recommendations for polishes, laps, and techniques for handling these…

Opals and pearls have special setting, cleaning, and storage needs. Our opal and pearl care guide will help you keep your jewelry beautiful.

Some opals from Spencer, Idaho show asterism or the “star stone” effect. Learn how to price these beautiful but rare star opals.