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Ametrine

Quartz

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: October 2021
Ametrine Polished Ametrine Rough Ametrine Jewelry
Find unique color combination gems at gemstones.com on Jedora.
Table of Contents
  • General Information
  • Ametrine Colors
  • Alternate Names
  • Countries of Origin
  • History
  • More About Ametrine

Ametrine is a bi-color quartz variety that, as its name suggests, is a unique combination of amethyst and citrine within a single crystal. How the gem forms is still a bit of a mystery, but the differences in color are believed to be the result of the presence of iron in different states of oxidation from natural heating. Combining the golden sunburst of citrine with the violet sunset of amethyst, this naturally colored gem is commercially mined at a single source: the remote Anah mine in Bolivia and is shrouded in fascinating local legends and lore.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Ametrine
Species
Quartz
Transparency
Transparent - Translucent
Dispersion
Strength: Weak Fire Value: 0.013
Refractive Index
1.544-1.553
Tolerance:very constant
Birefringence
0.009
Optic Character
Uniaxial
Optic Sign
Positive
Polariscope Reaction
Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
Dichroic, weak yellow-orange and purple
Hardness
7
Streak
White
Specific Gravity
2.640-2.690 Range:0.03/-0.02 Typical:2.660
Toughness
Good
Inclusions
Ametrine is a type II clarity stone. Color zoning in stones is often present in the form of "soap scum", "tiger stripes" or "zebra stripes", crystals, negative crystals, liquid inclusions, two-phase inclusions, partially-healed fractures, hematite needles.
Luster
Vitreous
Stability
Good
Fracture
Conchoidal
Cleavage
None
Chemical Name
silicon dioxide (aka silica)
Chemical Formula
SiO2
Crystal System
Trigonal
Chemistry Classification
Silicate

Ametrine Colors

  • Bi-color Ametrine
    Bi-color

Alternate Names

Trystine, Bolivianite, Amethyst-Citrine, Citrine-Amethyst, Golden Amethyst

Countries of Origin

Afghanistan; Russian Federation; Unknown; Botswana; Brazil; Thailand; Bolivia (Plurinational State of)

History

Ametrine is a naturally occurring quartz crystal that is divided into an amethyst portion and a citrine portion. Sometimes the color contrast is striking; a regal purple reigning beside a golden beauty. On other occasions, the colors are more pastel and make this a perfect stone for spring and summer.

More About Ametrine

Modern folklore tells us that ametrine combines the awareness of amethyst and the energy of citrine. Some believe that this stone stimulates the intellect and mental activity. Those who believe in the power of gemstones say that ametrine encourages optimism and promotes joy.

Shop Ametrine
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