Opals and pearls have special setting, cleaning, and storage needs. Our opal and pearl care guide will help you keep your jewelry beautiful.
Everything you ever wanted to know about opal gems. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.
Visit one of the top gem hunting spots in the US. Go alone or with the family. A gemology-themed vacation can be fun, educational, and (maybe) profitable.
The town of Coober Pedy, Australia produces more opal than anywhere else. Its culture has been thoroughly shaped by opal mining. Learn more about this colorful location and the methods used to hunt for precious opals.
How well do you know your birthstone gemology? Take our short quiz and learn about the composition, cutting, and value of birthstones.
Made from two or more materials, assembled gems can make durable and affordable jewelry. Learn more about gemstone doublets, triplets, and other varieties.
Gemstone luster describes how a gem's surface looks when it reflects light. Learn the common terms gemologists use for this property and what can affect it.
Looking for opal polishing advice? Our survey results can you help you choose the right polishes, laps, and polishing techniques for these popular gems.
Once the stone of kings, the fragile opal has a convoluted personality and lore. Opal symbolism is as varied as the play of color of the stone itself.
The faceting process turns rough stones into finished gems. Learn the steps custom faceters take to create unique gemstones that tell a client's story.