Updated as of June 2026

Every gemstone, scored, priced, and explained

The honest guide to gemstones and the jewelry you set them in. We rate all 112 stones with the AltGems Score, give real price ranges, and show you exactly how to buy. No upsell.

Amethyst Moissanite Lab-Grown Diamond Sapphire Ruby Emerald Opal Citrine Garnet Topaz Peridot Aquamarine

The AltGems Score

Nobody else rates stones on one honest scale. We score every gemstone from 0 to 10 on durability, brilliance, value, rarity, and everyday wearability, all computed from data. See how we score.

Diamond

Colorless · Mohs 10 8.0

Alexandrite

Green · Mohs 8.5 8.0

Padparadscha Sapphire

Orange · Mohs 9 7.8

Sapphire

Popular gemstone guides

Amethyst

Purple · $5 to $60/ct 7.4

Moissanite

Colorless · $200 to $800/ct 7.2

Lab-Grown Diamond

Colorless · $400 to $3,000/ct 7.8

Sapphire

Blue · $50 to $2,000/ct 7.8

Ruby

Red · $100 to $5,000/ct 6.8

Emerald

Green · $100 to $4,000/ct 4.6

Opal

White · $10 to $1,000/ct 6.6

Citrine

Yellow · $5 to $50/ct

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All gemstones

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Solitaire, halo, three stone

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Gifts

By recipient, budget, occasion

Birthstones

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Education

The 4 Cs and how to choose