gemstone

Ametrine

SiO2 (Silicon Dioxide with iron impurities)

AI-generated identification · may be incorrect

Hardness: 7 Mohs scale; Color: Zoned purple (amethyst) and yellow/orange (citrine); Luster: Vitreous; Crystal system: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.65.

Hardness: 7 Mohs scale
Color: Zoned purple (amethyst) and yellow/orange (citrine)
Luster: Vitreous

Identified July 18, 2026More gemstone →

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Physical properties

Hardness: 7 Mohs scale; Color: Zoned purple (amethyst) and yellow/orange (citrine); Luster: Vitreous; Crystal system: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.65.

Formation & geological history

Formed when amethyst and citrine occur in the same crystal due to a temperature gradient during crystallization. Most natural ametrine originates from the Anahi mine in Bolivia in hydrothermal veins.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants) and for lapidary art or metaphysical collection.

Geological facts

Natural ametrine occurs only in the Anahi mine; most others are heat-treated or synthetic. The color difference is caused by differing oxidation states of iron within the crystal structure.

Field identification & locations

Identify by the distinct, often sharp boundary between purple and yellow sectors. It is mainly found in Bolivia. Look for natural inclusions to distinguish from synthetic lab-grown versions.