specific gravity

Although lapidaries can cut cabochons and decorative objects from massive or translucent eudialyte crystals, transparent material suitable…

Jade is one of the most popular and expensive gemstones. It can also receive many enhancements. Learn about jade treatments and how to identify…

Gem identification is part detective work, part art. Learn how gemologists can distinguish gem species and determine whether a stone is natural…

Some gems contain both natural and lab-made components. Learn about these hybrid gemstones and how to distinguish them from mined gems.

What is Arizona black jade? Learn about this unusual opaque black gem material and follow this pendant carving demonstration by a master carver.…

Measuring “over the limit” (OTL) refractive indices can help distinguish diamonds from simulants. You can do this with a simple upgrade to…

Gemologists use the hot point test to determine if a piece is a plastic imitation or coated in wax. Learn more about this destructive test here.

How accurate are gem, mineral, and rock scanner identification apps? Our review covers the strengths and weaknesses of over 20 apps.

A glossary of frequently encountered gemstone faceting terms for the student gemologist. Our list covers gemology, gem cutting, and equipment.…