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 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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Trillion-cut vivid violetish blue gemstone held in stainless steel tweezers at Sapphire Row, its triangular outline spreading wide face-up for its carat weight Buying Guide
Sapphire Row

Carat Weight vs Size: Why Two One-Carat Gems Look Nothing Alike

Carat is a measure of weight, not size. Here is how density, cut depth and outline decide what a stone...

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Emerald-cut vivid slightly bluish green emerald held in warm gold-toned tweezers, showing whitish jardin veils and mossy internal texture across the table Colored Gemstones
Sapphire Row

Gemstone Clarity Explained: Which Inclusions Matter and Which Don't

Clarity in colored stones is not a ladder you climb. A guide to which inclusions are expected in which species,...

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A loose pear-shaped cornflower blue sapphire held tip-up in stainless steel tweezers at Sapphire Row, showing deeper saturation along the girdle and bright silvery-blue brilliance through the crown Colored Gemstones
Sapphire Row

Gemstone Color Explained: How Hue, Tone, and Saturation Set Value

Color decides more of a colored gemstone's value than anything else. Here is how hue, tone, and saturation actually work,...

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Round brilliant-cut violet-blue tanzanite photographed face-up at Sapphire Row, its crown facets showing bright, evenly distributed light return and no window Brilliance
Sapphire Row

Gemstone Cut Quality: How to Read Light in a Colored Stone

Color is only potential. Cut is what turns it into something your eye can see. A practical guide to judging...

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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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