inclusions

Crystallography is the study of crystalline solids. Learn the most common terms gemologists use to describe the structure of crystal gems.

Explore 37 blue gemstones from rare collectors’ specimens to durable jewelry options. Learn how to assess quality, understand durability factors,…

Kyanite’s physical properties make it very difficult to facet. However, it’s a popular collector’s gem, especially in sapphire-blue…

Faceting mistakes can cost gem cutters time and money. Learn some techniques for fixing common errors and making your repairs look like intentional…

When is recutting diamonds and other gems worthwhile for a professional gemologist? Learn how to make this determination and avoid potential…

A green to blue-green variety of microcline, amazonite makes a wonderful gemstone for cabbing and carving.

With bright, apple-green hues, chrysoprase makes an eye-catching jewelry stone. Our chrysoprase buying guide will help you pick a top-quality…

Gems in jewelry settings can’t be evaluated the same way as loose stones. These guidelines are for gemologists learning to grade set gemstones.…

What do you know about birthstones? Take our short birthstone quiz and learn about the makeup, cutting, and value of these popular gemstones.