Round brilliant-cut amethyst in a vivid reddish purple with violet-purple flashes around the crown, photographed face-up on a pale gray background at Sapphire Row
Amethyst
Sapphire Row

Purple Gemstones: A Gemologist's Guide to Choosing the Right Purple

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Gemstone knowledge from the source — sourcing insights, care guides, and buying advice to help you choose stones and jewelry with confidence.

Gemstone Journal

Round brilliant-cut violetish blue tanzanite photographed face-up at Sapphire Row, showing bright, evenly distributed light return across the crown facets — tanzanite is a species that is almost always heat treated Colored Gemstones
Sapphire Row

Gemstone Treatments Explained: What's Normal and What's Not

Almost every colored gemstone on the market has been treated in some way. Here is a gemologist's guide to which...

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Round brilliant-cut medium bluish green teal sapphire from Tanzania in stainless steel tweezers at Sapphire Row, showing yellowish green and blue-green color zoning, a stone whose gem lab report records species, treatment and origin Colored Gemstones
Sapphire Row

Gemstone Certification: How to Read a Gem Lab Report

A gem lab report is not a grade or an appraisal. It is a record of what a laboratory observed:...

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Elongated emerald-cut teal blue-green natural sapphire held in stainless steel tweezers against a soft neutral background at Sapphire Row Gemstone Certification
Sapphire Row

Heated vs. Unheated Sapphires: What Treatment Really Means for Value

Set two blue sapphires side by side and, in most cases, nothing your eye can catch will tell you which...

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