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
Round Green Amethyst Sterling Silver Engagement Ring with White Sapphire - Isabella Ring
This inspired design has a delicate wave of bezel-set gemstones curving on opposite sides of the center gemstone.Only $400.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring with White Sapphire - Isabella Ring
$400.00
Gemvara
Sterling Silver Promise Ring with Green Amethyst & Rose Quartz - Twin Hearts Ring
Two hearts, coming from opposite directions, meet in this charmingly irresistible ring design. Choose birthstones to show who you hold in your heart.Only $325.00 at Gemvara
no photoSterling Silver Promise Ring with Green Amethyst & Rose Quartz - Twin Hearts Ring
$325.00
Gemvara
14.50ct t.w. Italian Green Amethyst, .48ct t.w. Diamond Bracelet. 7.5"
14.50 ct. t.w. pear-shaped amethyst gems in a pretty pale green color romance this design. Beautifully highlighted by .48 ct. t.w. diamonds. Sterling silver bracelet.Only $295.00 at Ross-Simons
no photo14.50ct t.w. Italian Green Amethyst, .48ct t.w. Diamond Bracelet. 7.5"
$295.00
Ross-Simons
6.80 ct. t.w. Green Amethyst Rope Twist Earrings in 14kt Yellow Gold
In a gorgeous design styled for maximum illumination, these beautiful 6.80 ct. t.w. green amethyst rope twist earrings are a dazzling confection that's ready to make a fabulous fashion statement! Features a round green amethyst center and a twisted...Only $168.75 at Ross-Simons
no photo6.80 ct. t.w. Green Amethyst Rope Twist Earrings in 14kt Yellow Gold
$168.75
Ross-Simons
Round Green Amethyst Sterling Silver Engagement Ring - Basira Ring
A 6mm, round-cut center stone is held in a bold, braided setting. It makes for a brilliant display of your favorite precious metal and gem.Only $245.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring - Basira Ring
$245.00
Gemvara
Round Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring with Black Onyx - Sansa Ring
Dramatic yet delicate, this antique-inspired ring boasts a majestic 7mm center stone and 16 sparkling accent stones. It is carefully handcrafted in your choice of gems and metals.Only $390.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring with Black Onyx - Sansa Ring
$390.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring with White Sapphire - Sheltering Sky Ring
The sleek lines of this ring evoke an enfolding embrace. Set with birthstones, this style becomes a very fashionable mother-child ring.Only $340.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring with White Sapphire - Sheltering Sky Ring
$340.00
Gemvara
Green Amethyst Delphinium Ring - Stephen Dweck - Green (8)
Stephen DweckGreen Amethyst Delphinium RingDetailsOval 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...Only $440.00 at Neiman Marcus
no photoGreen Amethyst Delphinium Ring - Stephen Dweck - Green (8)
$440.00
Neiman Marcus
Sterling Silver Green Amethyst, Brazilian Amethyst, EYE Drusy Quartz Pendant
Handmade by Master Artisan. See more details at JeGem.com.Only $186.74 at JeGem.com
no photoSterling Silver Green Amethyst, Brazilian Amethyst, EYE Drusy Quartz Pendant
$186.74
JeGem.com
Pear Black Onyx Sterling Silver Engagement Ring with Green Amethyst - Madeline Ring
A dramatic pear-shaped gem is surrounded by two trilliants in this finger flattering variation of the classic three-stone ring.Only $395.00 at Gemvara
no photoPear Black Onyx Sterling Silver Engagement Ring with Green Amethyst - Madeline Ring
$395.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring - Fiona Ring
The triqueta, the Celtic symbol for the trinity, has many meanings. Its elegant symmetry adds rich symbolism to this solitaire ring style.Only $380.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring - Fiona Ring
$380.00
Gemvara
Round Green Amethyst Sterling Silver Promise Ring with Amethyst & Smoky Quartz - Faye Ring
A gorgeous, 5mm round center stone is flanked by accent gems set into the band. Tastefully stunning.Only $380.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Promise Ring with Amethyst & Smoky Quartz - Faye Ring
$380.00
Gemvara
Men's Round Green Amethyst Sterling Silver Ring - Splash Ring
This detailed, masculine ring features a single, prong-set, 6mm stone and is carefully handcrafted in your choice of gems and metals.Only $215.00 at Gemvara
no photoMen's Round Green Amethyst Sterling Silver Ring - Splash Ring
$215.00
Gemvara
Round Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring - Charlotte Ring
Intricately engraved detailing adds romance to this timeless ring style that's lovely from every angle.Only $330.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring - Charlotte Ring
$330.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring - Fiona Ring
The triqueta, the Celtic symbol for the trinity, has many meanings. Its elegant symmetry adds rich symbolism to this solitaire ring style.Only $320.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring - Fiona Ring
$320.00
Gemvara
 


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