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Identifying Jade Treatments

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

Color Filters: Uses and Limitations for Gemology

A set of color filters can be helpful in the field and in the lab. Learn the limitations and uses of color filters for gemology.

Hybrid Gemstones: Glass Rubies and More

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

32 Green Gemstones (How Many Do You Know?)

A favorite color for nature-inspired designs, green gemstones never go out of style. Learn which of these 32 green gems hold up best for engagement…

Appraising Rubies

Appraising rubies is a skill every jeweler and gemologist needs to master. Learn about the different quality factors that can affect ruby prices.…

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An Introduction to Gemstone Inclusions

Gemstone inclusions are materials trapped inside gems as they form. Learn how gemologists use inclusions to help identify gemstones and their…

What Does the GIA Colored Gem Grading Code Mean?

The GIA grading system describes gem color in terms of hue, tone, and saturation. Learn what the abbreviations and numbers of this gem grading code…

Identifying Inclusions of Specific Gems

Some natural as well as synthetic gems have specific, characteristic inclusions. Learn the identifying inclusions of some of the most popular…

Gem Price Guide

The IGS Gem Price Guide covers many popular as well as unusual, collectible gems. Find your gem’s retail value based on its type, size, and qualities.…