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 Promise Ring - Clover Ring
Simple and stunning, the Clover Ring features a round, prong-set stone encircled by a flowing metal clover. It is carefully handcrafted in your choice of gems and metals.Only $290.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Promise Ring - Clover Ring
$290.00
Gemvara
4.73 TCW Marquise-Cut Genuine Green Amethyst and Peridot 10k Gold Ring
Grand entrance color and style. Opulence shines from every angle of this ring lavished with marquise-cut green amethyst and peridot. A stunning selection offering 4.73 carats T.W. of gemstones and diamond accents. 10k gold. Sizes 6-9. (All carat...Only $351.49 at PalmBeachJewelry
no photo4.73 TCW Marquise-Cut Genuine Green Amethyst and Peridot 10k Gold Ring
$351.49
PalmBeachJewelry
Oval Green Amethyst Sterling Silver Engagement Ring - Oval Trellis Solitaire Ring
A lovely filigree trellis gallery adds delicacy to this classic solitaire ring.Only $220.00 at Gemvara
no photoOval Green Amethyst Sterling Silver Engagement Ring - Oval Trellis Solitaire Ring
$220.00
Gemvara
Round Green Amethyst Sterling Silver Promise Ring - Bezel Ring
This sleek streamlined ring design has timeless elegance. The perfect choice for a woman with an active lifestyle and a refined sense of style.Only $210.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Promise Ring - Bezel Ring
$210.00
Gemvara
Cushion Green Amethyst Sterling Silver Engagement Ring - Enrapture Ring
A stunning cushion-cut gem of impressive proportions crowns a sleek and streamlined ring that is designed to capture light and turn it into brilliance. You'll find yourself talking with your hands.Only $230.00 at Gemvara
no photoCushion Green Amethyst Sterling Silver Engagement Ring - Enrapture Ring
$230.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring - Enfold Ring
The band of this beautiful design flows elegantly around the center gem, embracing it.Only $270.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring - Enfold Ring
$270.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring with Rock Crystal & Smoky Quartz - Mia Ring
Classic but contemporary too. A sleek seam of gems adds brilliance to the elegantly rounded design of this ring.Only $340.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring with Rock Crystal & Smoky Quartz - Mia Ring
$340.00
Gemvara
Cushion Green Amethyst Sterling Silver Engagement Ring - Enrapture Ring
A stunning cushion-cut gem of impressive proportions crowns a sleek and streamlined ring that is designed to capture light and turn it into brilliance. You'll find yourself talking with your hands.Only $300.00 at Gemvara
no photoCushion Green Amethyst Sterling Silver Engagement Ring - Enrapture Ring
$300.00
Gemvara
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 photo31.00ct t.w. Green Amethyst, .10ct t.w. Diamond Drop Earrings
$153.75
Ross-Simons
Round Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring with Green Tourmaline - Flamenco Ring
The swirl of a skirt, the snap of a fan: the drama and passion of flamenco is captured in this vintage-inspired design. It is carefully handcrafted in your choice of gems and metals.Only $335.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Vintage-Inspired Engagement Ring with Green Tourmaline - Flamenco Ring
$335.00
Gemvara
Round Green Amethyst Sterling Silver Earrings - Gem Flame Earrings
A crown of fire sets this classic drop gemstone earrings ablaze. As versatile as stud earrings but subtly sophisticated, these earrings will soon become your go-to favorites.Only $260.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Earrings - Gem Flame Earrings
$260.00
Gemvara
2.50ct Green Amethyst, .10ct t.w. Diamond Pendant in 14kt White Gold
Sophisticated silhouette! This green amethyst and diamond pendant features the tranquil tones of a 2.50 carat pear-shaped green amethyst with .10 ct. t.w. of round single-cut diamonds. Single bale accommodates up to 2mm chain, sold separately. 14kt...Only $296.25 at Ross-Simons
no photo2.50ct Green Amethyst, .10ct t.w. Diamond Pendant in 14kt White Gold
$296.25
Ross-Simons
Round Green Amethyst 14K White Gold Promise Ring - Simply Round Solitaire
Less is more in this sleek solitaire ring with round brilliant-cut center. Delicate, feminine and simply stylish, this ring is perfect worn alone or stacked. Different stone sizes and band widths are available.Only $325.00 at Gemvara
no photoRound Green Amethyst 14K White Gold Promise Ring - Simply Round Solitaire
$325.00
Gemvara
Round Green Amethyst Sterling Silver Promise Ring - Timeless Knot Ring
An elegant ring with a 5mm center stone, this knot is carefully handcrafted in your choice of gems and metals.Only $195.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Promise Ring - Timeless Knot Ring
$195.00
Gemvara
Round Green Amethyst Sterling Silver Engagement Ring - Double Clover Ring
Simple and stunning, the Clover Ring features a round, prong-set stone encircled by two layers of clover leaves. It is carefully handcrafted in your choice of gems and metals.Only $365.00 at Gemvara
no photoRound Green Amethyst Sterling Silver Engagement Ring - Double Clover Ring
$365.00
Gemvara
 


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