inclusions

Mastering the art of color grading white diamonds is a challenge. Learn about the standards, terms, tools, and testing procedures and start practicing.…

Although marketed as “angel skin opal,” “rock wood,” and “mountain leather,” palygorskite is neither opal, wood, nor leather.…

The idea of a single birthstone for each month is a modern idea with a long history, but today’s consumers can choose gems from traditional or modern…

Gemologists sometimes measure gemstone density or specific gravity to help with gem identification. Learn the basics of this property and how…

Learn how varied gemology careers can be. Our gemology book reviews highlight three different approaches — as art, science, and business.

In the gem design stage of jewelry making, faceters evaluate a stone’s qualities. Learn how to choose a cut for a gemstone as unique as your personal…

Can gem grading avoid subjective terms? Learn about gemologist Jeff Graham’s common sense gemstone grading system, an alternative to commercial…

Although long known best for being misidentified as ruby, the spinel gem is beautiful in its own right. Its colors, durability, and relative affordability…

Leftover gemstone rough is a great material for learning to cut cabochons. Learn advanced cabbing techniques and find new inspiration for jewelry…