gemstone

Ametrine

SiO2 (Silicon Dioxide with iron impurities)

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 →

Explore Ametrine in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.

Other gemstone specimens

See all

Diamond and Gold Jewelry

Carbon (Diamond) / Au (Gold)

gemstone

Cubic Zirconia (simulant) or Diamond

ZrO2 (Cubic Zirconia) or C (Diamond)

gemstone

Ammolite

Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)

mineral

Cubic Zirconia (or possibly Diamond)

Zirconium dioxide (or Carbon)

gemstone

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

gemstone