PRASIOLITE, the green variety of quartz
(also known as Green Amethyst)

VARIETY INFORMATION:

  • VARIETY OF: Quartz , SiO 2 .
  • USES: Gemstone and ornamental stone.
  • COLOR: a pale lime-green
  • INDEX OF REFRACTION: 1.544-1.553
  • BIREFRINGENCE: 0.009
  • HARDNESS: 7
  • CLEAVAGE: none
  • CRYSTAL SYSTEM: trigonal
  • For natural prasiolite mineral specimens see our For Sale or Sold lists

Prasiolite (or vermarine) is the name for any quartz crystal or cluster that is green in color. Although often cut as a gemstone, prasiolite is actually quite rare in nature.

Most prasiolites on the market are heat treated amethyst. These stones are sometimes called "Green Amethyst", possibly because amethyst is the starting variety, or possibly just because it sounds more valuable that way. When heat treated, the amethyst from most locations transforms into yellow or orange citrine. From a few locations, a green color results. These locations include Montezuma, Brazil, and Arizona. Naturally occurring prasiolite has been reported from Poland.

Prasiolite (sometimes spelled praziolite) can be confused with the similarly colored praseolite which results from the heat treatment of iolite, a variety of cordierite. Note the spellings: prasiolite is the quartz variety, while praseolite is the cordierite variety - not the other way around (which would be easier to remember).

Note that prasiolite is macro-crystalline quartz. A green cryptocrystalline quartz, where the individual crystals are too small to be seen and the resulting transparency is translucent, would be called chrysoprase. The term prase is sometimes used for any leek-green color of quartz, whether macro- or cryptocrystalline.

Some colorless quartz crystals have sufficient inclusions of chlorite to result in a green color. However, this would not be considered prasiolite. In any event, the color is wrong - more of a dark grass-green than a leek-green. Note that green ghost crystals inside a clear quartz crystal is almost certainly a chlorite coating over an earlier quartz crystal, and not an example of quartz over prasiolite.

Prasiolite is only one of several quartz varieties. Other varieties that form macroscopic (large enough to see) crystals are as follows:

Prasiolite Jewelry - Hover over an item for more information
Sterling Silver Green Amethyst Hook Earrings Jewelry
This Earrings was handmade by a master artisan and is one of a kind.Only $61.49 at JeGem.com
no photoSterling Silver Green Amethyst Hook Earrings Jewelry
$61.49
JeGem.com
ONLINE ONLY - Alexandra Gem Multicolor Gemstone Crisscross Ring, Womens
Chic and unique, this eye-catching ring features a crisscross design with a spattering of soft-hued gemstones. Metal: Rhodium-plated sterling silverStones: Lab-created amethyst, blue spinel, green quartz and red ruby, 9x7mm, 6x4mm, 5x5mm, 5x3mmOther...Only $124.99 at jcpenney
no photoONLINE ONLY - Alexandra Gem Multicolor Gemstone Crisscross Ring, Womens
$124.99
jcpenney
12.10 Cushion-Cut Green Amethyst and White Topaz Accented Ring in Platinum over Sterling Silver, Size 6,7,8, Size 6,7,8
Rated by 25,000+ Customers. 12.10 Cushion-Cut Green Amethyst and White Topaz Accented Ring in Platinum over Sterling SilverOnly $123.49 at PalmBeachJewelry
no photo12.10 Cushion-Cut Green Amethyst and White Topaz Accented Ring in Platinum over Sterling Silver, Size 6,7,8, Size 6,7,8
$123.49
PalmBeachJewelry
Diamond & Green Amethyst Filigree Design Ring 14k White Gold (0.60ct)
This gorgeous gemstone band features genuine and high quality green amethysts alternating with bright brilliant-cut round diamonds. The stones are elegantly set in 14k white gold setting and are circling half-way around the ring. The ring features...Only $640.00 at Allurez.com
no photoDiamond & Green Amethyst Filigree Design Ring 14k White Gold (0.60ct)
$640.00
Allurez.com
Ross-Simons 7.10 ct. t.w. Multi-Stone Dome Ring in 14kt Yellow Gold Over Sterling
Be captivated by the swirling color of this dome ring. Featuring a flowing formation of 7.10 ct. t.w. oval multi-stones, including amethyst, citrine, garnet and peridot. 14kt yellow gold over sterling silver ring.Only $100.00 at Ross-Simons
no photoRoss-Simons 7.10 ct. t.w. Multi-Stone Dome Ring in 14kt Yellow Gold Over Sterling
$100.00
Ross-Simons
Ross-Simons 7.50ct Green Amethyst Ring, White Topaz Accents in Silver
Go big when you go green: this ring showcases a 7.50 carat cushion-cut green amethyst in a roped setting with white topaz accented sides. Textured and polished sterling silver ring.Only $125.00 at Ross-Simons
no photoRoss-Simons 7.50ct Green Amethyst Ring, White Topaz Accents in Silver
$125.00
Ross-Simons
2.32-Carat Cushion-Cut Genuine Green Amethyst and Diamond Accent Platinum over Sterling Silver Ring, Size 10,6,7,8,9, Size 10,6,7,8,9
Rated by 25,000+ Customers. 2.32-Carat Cushion-Cut Genuine Green Amethyst and Diamond Accent Platinum over Sterling Silver RingOnly $94.95 at PalmBeachJewelry
no photo2.32-Carat Cushion-Cut Genuine Green Amethyst and Diamond Accent Platinum over Sterling Silver Ring, Size 10,6,7,8,9, Size 10,6,7,8,9
$94.95
PalmBeachJewelry
Green Amethyst Delphinium Ring - Stephen Dweck
Oval green amethyst stone. Sterling silver setting forms delphinium motif. Round-cut chrome diopside adorns floral centers. Signature Stephen Dweck floral and foliage motif alludes to the designer's love of nature. 1 1/4inL.Only $440.00 at Neiman Marcus
no photoGreen Amethyst Delphinium Ring - Stephen Dweck
$440.00
Neiman Marcus
Sterling Silver Green 3-Stone Hoop Earrings - Stephen Dweck
Sterling silver Stephen Dweck hoop earrings with granulated finish. Faceted variscite, green amethyst, and green quartz cathedral stations. 2 3/4in diameter. Post backs. Made in USA.Only $395.00 at Neiman Marcus
no photoSterling Silver Green 3-Stone Hoop Earrings - Stephen Dweck
$395.00
Neiman Marcus
Ross-Simons 8.75 Carat Green Amethyst Ring in Sterling Silver
For a ritzy, dressy look, choose this 8.75 carat green amethyst ring and make a statement to the world. The glowing pear-shaped green amethyst creates a gorgeous display for year-round, all season wearing. Sterling silver ring.Only $125.00 at Ross-Simons
no photoRoss-Simons 8.75 Carat Green Amethyst Ring in Sterling Silver
$125.00
Ross-Simons
Sterling Silver Green Amethyst Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $94.49 at JeGem.com
no photoSterling Silver Green Amethyst Ring Jewelry
$94.49
JeGem.com
Ross-Simons 9-9.5mm Cultured Baroque Pearl, 43.50ct t.w. Multi-Stone Necklace. 36"
The natural opulence of this 5-13mm cultured freshwater baroque pearl and 43.50 ct. t.w. multi-stone necklace is so beautiful and will blend with many styles. Features blue topaz, burgundy garnet, yellow citrine, green peridot and purple amethyst...Only $206.25 at Ross-Simons
no photoRoss-Simons 9-9.5mm Cultured Baroque Pearl, 43.50ct t.w. Multi-Stone Necklace. 36"
$206.25
Ross-Simons
Ross-Simons 7.95 Carat Green Amethyst Ring With Diamonds in Sterling Silver
Fabulously intriguing and inviting, this 7.95 carat, cushion-cut green amethyst ring shimmers within presence and panache. Note the twinkling diamond accents adorning the band. Sterling silver ring.Only $250.00 at Ross-Simons
no photoRoss-Simons 7.95 Carat Green Amethyst Ring With Diamonds in Sterling Silver
$250.00
Ross-Simons
Ross-Simons 15.70ct t.w. Multi-Stone Station Necklace in Silver. 18"
This necklace presents a parade of bright color and fun multi-shapes, with 15.00 ct. t.w. multi-stone stations. Gemstones include purple and green amethyst, blue topaz, and citrine. Lobster clasp, sterling silver necklace.Only $146.25 at Ross-Simons
no photoRoss-Simons 15.70ct t.w. Multi-Stone Station Necklace in Silver. 18"
$146.25
Ross-Simons
Ross-Simons 31.00ct t.w. Green Amethyst, .10ct t.w. Diamond Drop Earrings
Emerald cuts showcase the deep, lush hue of 31.00 ct. t.w. green amethyst. Embellished with .10 ct. t.w. Diamonds. Earwires, sterling silver earrings.Only $153.75 at Ross-Simons
no photoRoss-Simons 31.00ct t.w. Green Amethyst, .10ct t.w. Diamond Drop Earrings
$153.75
Ross-Simons
 


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