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AMETRINE

gcr.edu.vn 13 October, 2018
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AMETRINE

AMETRINE This transparent quartz has colors of both amethyst and citrine, and is called ametrine or amethyst-citrine.

OVERVIEW

ABOUT AMETRINE

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.

NATURE’S GIFT

The presence of amethyst and citrine colors in a quartz crystal is a rare gift of nature.

CUTTER’S CHOICE

Ametrine’s colors blend, combine, and contrast uniquely in each gem.

FACTS

    • Mineral: Quartz
    • Chemical composition: SiO2
    • Color: Bicolor orange/yellow and purple
    • Refractive index: 1.544 to 1.553
    • Specific gravity: 2.66 (+0.03/-0.02)
  • Mohs hardness: 7

QUALITY FACTORS

The following factors combine to determine ametrine’s value.

COLOR

Fine ametrines show beautiful contrast between their orange and purple shades.

CLARITY

Faceted ametrine generally has no eye-visible inclusions.

CUT

Unusual cutting styles add drama to ametrine’s unique color combination.

CARAT WEIGHT

A wide range of sizes is available. Large material is popular with gem carvers.

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