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Peridot

BIRTHSTONE:

Peridot is the birthstone for the month of August. It is the gemstone for the 15th anniversary. 

PERIDOT DESCRIPTION: 

64.57-carat Cut Peridot and 7.9-cm Tall Crystal
While the 64.57-carat cut peridot is magnificent, it is overshadowed by the amazing 
7.9-cm tall crystal. Both are from Sappat, Kohistan, Pakistan. - Jeffrey Scovil
Gem miners find peridot as irregular nodules (rounded rocks with peridot crystals inside) in some lava flows in the United States, China, and Vietnam and, very rarely, as large crystals lining veins or pockets in certain types of solidified molten rock. Sources for the latter include Finland, Pakistan, Myanmar, and the island of Zabargad.

Suite of Peridot Jewelry
This incredible suite of peridot jewelry has a total weight of 350.40 carats. All are top-quality peridots from Pakistan. - © GIA & Harold & Erica Van Pelt
Geologists believe both types of deposits relate to the spreading of the sea floor that occurs when the earth’s crust splits, and rocks from its mantle are pushed up to the surface. Sometimes—as in Myanmar— these rocks can be altered, deformed, and incorporated into mountain ranges by later earth movements.

Rarely, peridot can have an extraterrestrial source, being contained in meteorites that have fallen to earth.

The color range for peridot is narrow, from a brown-green color to yellowish green to pure green. Yellowish green is the most common peridot color seen in jewelry.

Princess Cut Peridot
Peridot is best known for its yellowish green color.
Peridot is the gem variety of the mineral olivine. Its chemical composition includes iron and magnesium, and iron is the cause of its attractive yellowish green colors. The gem often occurs in volcanic rocks called basalts, which are rich in these two elements.

Healing Sisters
These peridots from Peridot Mesa in the San Carlos Apache Nation, Arizona, are set in a jewelry style called "Healing Sisters.” - Courtesy Apache Gems
 
PERIDOT QUALITY FACTORS:
130.60-ct Cushion-Shaped Peridot
This magnificent 130.60-carat antique cushion-cut peridot displays the gem's finest attributes: a medium-toned, highly saturated yellowish green hue and high clarity.
Peridot is readily available for many types of jewelry. It can be very affordable and attractive, even in normal commercial qualities. Peridot can also come in large sizes and very intense colors to satisfy the most discriminating colored gemstone connoisseur.

Color
Peridot’s color ranges from pure green to yellowish green to greenish yellow. The finest hue is green without any hint of yellow or brown. The gem’s colors tend to be at their finest in stones weighing 10 carats and above. Lower-quality peridot is brownish.

Pure green stones are rare, and most peridots are more yellowish green. The higher-quality stones have an intense color. Most of the stones with the finest color come from Myanmar and Pakistan.

Clarity
Most of the better-quality, calibrated material and larger single pieces on the market have no eye-visible inclusions, with tiny black spots—actually minute mineral crystals—visible under magnification. Other inclusions common in peridot are reflective, disk-shaped inclusions called “lily pads.”

Lily Pads
These disk-like fracture inclusions in peridot are descriptively called lily pads.
Readily visible inclusions, especially the dark spots, lower the value of peridot. There’s a dramatic drop in value for light-colored material with prominent dark inclusions.

Black Mineral Crystals in Peridot
If black mineral crystals in peridot are visible to the eye, they lower the stone’s value.
Cut
Peridot is cut in a wide variety of shapes and cutting styles. Production includes all the standard gem shapes such as round, oval, pear, cushion, triangle, and marquise shapes.

Checkerboard-cut Peridot
Peridot is popular for some uncommon cuts like the checkerboard. - Courtesy Gem Center Northwest
Cutting styles are also well represented. Brilliant cuts with triangular and kite-shaped facets, step cuts with concentric rows of parallel facets, and mixed cuts usually consisting of brilliant-cut crowns and step-cut pavilions are all common. Designer cuts fashioned by hand and machine are popular, as well as cabochons, beads, and carvings.

Peridot Earrings
Peridot is commonly cut in standard shapes and sizes for jewelry. - Courtesy Rio Grande
Carat Weight
Standard peridot cuts for the jewelry industry include a wide range of shapes and sizes. The gem is inexpensive in smaller sizes, but prices rise for gems above 10×8 mm. The finest large peridots come from Myanmar— formerly Burma—and, more recently, from a source high in the Himalayas of Pakistan. More-standard sizes and qualities come mostly from the United States (Arizona) and China.

Peridot
The peridot crystals weigh 128.82 and 393.83 carats, while the cut stones weigh
18.50 to 64.61 carats. All are from Pakistan. - Courtesy Shades of the Earth
 
ALL CONTENT IS FROM:"Peridot." GIA. N.p., n.d. Web.
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