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An Introduction to Gem Identification

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

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Trapiche Gems: An Introduction

Satisfying the human desire for symmetry, trapiche gems have a special allure. Learn what makes these rarities so unique in our introductory article.

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Spinel Buying Guide

Our spinel buying guide can help you learn how spinels are graded, what to avoid, and how to identify a high quality stone or a bargain in the rough.

Spinel Gemstones - Sri Lanka
Spinel Value, Price, and Jewelry Information

Everything you ever wanted to know about spinel. Find value guidelines, scientific data, expert comments, and more in our Gemstone Listings.

Buying Gemstones in Afghanistan: A Beginner’s Guide

Considering buying gems in Afghanistan? Learn which Afghan gemstones to seek out, which to avoid, and prepare for a “buyer beware” experience.

Refractive Index List of Common Household Liquids

Gemologists may immerse gems in refraction fluids during examinations. This refractive index list of household liquids offers some common alternatives.

Faceted Gemstones And Light Return Measurements

What factors determine the light return of faceted gemstones? Facet quality, polish, color, and cut style all play roles. Learn more about these variables.

Understanding Gem Synthetics, Treatments, And Imitations, Part 4: Synthetic Gemstone Guide

Many varieties of gems besides diamond can be created in the laboratory. Our synthetic gemstone guide covers many examples and explains their manufacture.