Whether projecting from pegmatite walls or encrusting cavities in volcanic rock, quartz abounds worldwide. People have used quartz in jewelry for thousands of years. When quartz displays the colors of amethyst and citrine in a single gem, the material is called ametrine or amethyst-citrine. Ametrine’s only commercial source is the Anahi mine in Bolivia.
No place else
There is only one commercial source for ametrine: the Anahi mine in Bolivia.
The presence of amethyst and citrine colors in a quartz crystal is a rare gift of nature.
Ametrine’s colors blend, combine, and contrast uniquely in each gem.
Bicolor orange/yellow and purple
1.544 to 1.553
- Mohs hardness: 7
There are a number of processes used to alter the color, apparent clarity, or improve the durability of gems.Learn More
Some gemstones have synthetic counterparts that have essentially the same chemical, physical, and optical properties, but are grown by man in a laboratory.Learn More
Any gem can be imitated—sometimes by manmade materials or by natural materials chosen by man to impersonate a particular gem.Learn More
Why We Love This Gemstone
No two ametrines look the same because the colors in each gem combine in a unique way.
There’s only one commercial source of ametrine, so the supply is very limited.
A Cutter’s Inspiration
Cutters delight in finding ways to maximize the beauty of ametrine.
The following factors combine to determine ametrine’s value.
Fine ametrines show beautiful contrast between their orange and purple shades.
Faceted ametrine generally has no eye-visible inclusions.
Unusual cutting styles add drama to ametrine’s unique color combination.
A wide range of sizes is available. Large material is popular with gem carvers.
Ametrine Quality Factors: The Comprehensive Guide
Explore sources, gemological research, and the role of gems in history.
From the Andes to the Pantanál: In Search of AmetrineRobert Weldon, GIA , Apr 30, 2013 Read Article
The Anahí Ametrine Mine, BoliviaPaulo M. Vasconcelos, Hans-Rudolf Wenk and George R. Rossman , Mar 1, 1994 Read Article
Russian Synthetic AmetrineVladimir S. Balitsky, Taijin Lu, George R. Rossman, Irina B. Makhina, Anatolii A. Mar’in, James E. Shigley and Shane Elen, and Boris A. Dorogovin , Jun 1, 1999 Read Article
Gemstones of the World