Ametrine

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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.

Ametrine Polished
Ametrine Classification
Common Name Ametrine
Species Quartz
Ametrine Optical Properties
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
Ametrine Characteristic Physical Properties
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
Ametrine Chemistry & Crystallography
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; Unknown; Botswana; Russian Federation (the); 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.

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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.

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Tim Matthews

Author

Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.