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

Heart-shaped brilliant-cut tanzanite in a medium to medium-dark violetish blue, held in polished stainless steel tweezers at Sapphire Row, showing violet flashes across the crown facets Aquamarine
Sapphire Row

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

Sapphire, tanzanite, aquamarine, spinel, cuprian tourmaline, zircon and apatite can all read as blue across a tray — and they...

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Unheated round brilliant-cut Tanzanian parti sapphire held in stainless steel tweezers at Sapphire Row, showing a medium bluish green teal body with yellowish green and blue-green color zoning across the crown Color Zoning
Sapphire Row

Parti Sapphires and Teal Sapphires: The Beauty of Color Zoning

Parti sapphires show two or more colors in a single natural crystal. A gemmologist explains what causes the zoning, how...

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Round brilliant-cut unheated Tanzanian sapphire in a medium bluish green teal, held in stainless steel tweezers at Sapphire Row, showing yellowish green and blue-green color zoning across the crown — the September birthstone beyond classic blue Birthstones
Sapphire Row

September Birthstone: A Gemologist’s Guide to Sapphire

Sapphire is the September birthstone — and it comes in every color except red. A working gemologist’s guide to sapphire...

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

Gemstone Origin: Why Where a Stone Was Mined Changes Its Value

Origin is the one value factor you cannot see in a stone. Here is how Burma, Mozambique, Kashmir, Colombia and...

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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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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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