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Ammolite Buying Guide

With bright rainbow iridescence, ammolite is sure to draw attention. Read about this gem’s unique quality factors before your next ammolite buying trip.

4 Minute Read

For the best ammolite buying experience, learn about this unique gem’s quality factors.

Ammolite Buying and the Four Cs

Although ammolite grading differs from other colored gemstones, the Four Cs still prove useful for understanding ammolite quality.

The IGS ammolite value listing has price guidelines for ammolite naturals, doublets, and triplets.


Color is the most important factor in ammolite quality. Higher quality ammolite exhibits more, brighter colors, greater iridescence, shifting color with different viewing angles, and color regardless of the gem’s rotation.

Number and Rarity of Colors

Ammolite can display any color of the rainbow, but specimens that display three or more colors are the most desirable.

Red and green hues are common, while blue, violet, gold, and crimson are rare.


Ammolite’s unique structure allows for beautiful iridescence. In this gem, tiny aragonite crystals align in a plate-like structure whose thickness is near the wavelength of white light. Because of this, a mesmerizing play of color appears in the stone. Ammolite with greater iridescence will have more value.

Chromatic Shift

As a piece of ammolite rotates, an observer can witness changing colors. Lower-quality ammolite is monochromatic, meaning a slight change, perhaps from a lime green to a…

Addison Rice

A geologist, environmental engineer and Caltech graduate, Addison’s interest in the mesmerizing and beautiful results of earth’s geological processes began in her elementary school’s environmental club. When she isn’t writing about gems and minerals, Addison spends winters studying ancient climates in Iceland and summers hiking the Colorado Rockies.

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