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Gemstone luster describes how a gem's surface looks when it reflects light. Learn the common terms gemologists use for this property and what can affect it.

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FTC Guidelines for Grading Diamond Quality

The FTC requires jewelers to accurately represent the diamond quality grading systems they use. Learn the guidelines and protect yourself from liability.

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What is Gemstone Birefringence?

Gemstone birefringence is a measure of a gem's double refraction. Learn how it’s used to identify gems and see the effects birefringent gems can display.

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Properties of Diamond Simulants

Diamond simulants, materials that look like real diamonds, often appear in jewelry. See how the properties of real diamonds compare with popular imitations.

Diamond Look-alike Comparison Chart

Distinguishing a diamond look-alike from the real thing can be challenging. Learn how to use specific gravity and birefringence to make simple separations.

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What is Gemstone Dispersion?

Learn what gemstone dispersion means, what causes it, and how it relates to other optical effects of gems. Check out some amazing dispersion examples, too.

Master Diamond Cutter Mike Botha Takes On Esperanza

The Esperanza is the most valuable diamond ever mined in the US. Learn the story behind the find and the unique triolette cut designed to showcase this gem.

Carats And Gemstone Grading

Carats are the units used to measure gem weight and one of the main factors in gem grading. Learn what affects the value per carat of various gem species.

Diamond Rough and Equipment For The Occasional Diamond Cutter

Finding good diamond rough and the right equipment can be challenging for a non-professional diamond cutter. Learn what to look for here.

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