Ametrine

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Physical & Optical Properties

Mohs Hardness 7,0
Specific Gravity 2,65
Refractive Index 1,544 – 1,553
Crystal System Trigonal
Luster Vitreous
Color various
Birefringence 0,009
Dispersion 0,013

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Ametrine
Mohs hardness of Ametrine shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Ametrine
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Ametrine

Ametrine is a bicolored variety of quartz in which amethyst's purple and citrine's yellow-orange zones occur within a single crystal, creating a striking natural color gradient. It forms only in the Anahi Mine in eastern Bolivia, making it one of the few gemstones with a single known primary commercial source in the world. The sharp, geometric boundary between purple and gold zones is entirely natural, caused by temperature variations during crystal growth.

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Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Ametrine?
Ametrine is a bicolored variety of quartz in which amethyst's purple and citrine's yellow-orange zones occur within a single crystal, creating a striking natural color gradient. It forms only in the Anahi Mine in eastern Bolivia, making it one of the few gemstones with a single known primary commerc
What is the hardness of Ametrine?
Ametrine has a Mohs hardness of 7.0, making it excellent for use in jewelry.
What color is Ametrine?
Ametrine is primarily Various.
How much does Ametrine cost?
Ametrine falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Ametrine?
Ametrine belongs to the Trigonal crystal system.

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