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A pastel dream, this variety of quartz boasts a beautiful soft green color. Sometimes incorrectly referred to by the misnomers "green amethyst" or "lime citrine," prasiolite is rarely found in nature, so most material available on the market is produced by heating or irradiating amethyst. Prasiolite is an exciting gem in that it is readily available in large sizes with high transparency and great durability.

Prasiolite Polished
Prasiolite Classification
Common Name Prasiolite
Species Quartz
Prasiolite 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, unobservable or weak, varying shades of body color
Prasiolite Characteristic Physical Properties
Hardness 7
Streak White
Specific Gravity 2.640-2.690 Typical:2.660
Toughness Good
Inclusions Prasiolite is a type II clarity stone. Stones may contain crystals, negative crystals, liquid inclusions, two-phase inclusions and partially-healed fractures.
Luster Vitreous
Stability Good
Fracture Conchoidal
Cleavage None
Prasiolite Chemistry & Crystallography
Chemical Name silicon dioxide (aka silica)
Chemical Formula SiO2
Crystal System Trigonal
Chemistry Classification Silicate

Prasiolite Colors

  • Green Prasiolite Green

Alternate Names

Green Quartz, "Greened Amethyst"

Countries of Origin

Tanzania, United Republic Of; United States of America (the); Uruguay; Madagascar; Thailand; Bolivia (Plurinational State of); India; Mozambique; Unknown; China; Brazil; Mexico; Zimbabwe


Prasiolite is an easy-going, gentle, pastel-green stone. Although it's found naturally, it's extremely rare. So... we nudge Mother Nature! As with many stones, heat treatments are transforming. Amethyst from Montezuma, Minas Gerais, Brazil was first found to turn green when it was heated. Since then material from Four Peaks, Arizona; Zimbabwe; CearĂ¡, Brazil; and a location in California have also been found to turn green upon treatment. Because prasiolite is a variety of quartz, it's a seven on the scale of hardness and therefore extremely wearable.


Avoid a jeweler's torch.

More About Prasiolite

One of the folkloric attributes of prasiolite is that it fosters compassion. Those who believe in the powers of gemstones say that this stone encourages self-acceptance and self-honor, that it ignites love and brings spiritual ideals into everyday life. Embrace its easy and enviable green.

Prasiolite Gemstone

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Tim Matthews


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.