Reference: PRU 23F
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Olivine, of which peridot is a type, is a common mineral in mafic and ultramafic rocks, often found in lava and in peridotite xenoliths of the mantle, which lava carries to the surface; however, gem-quality peridot occurs in only a fraction of these settings. Peridots can also be found in meteorites.
Peridots can be differentiated by size and composition. A peridot formed as a result of volcanic activity tends to contain higher concentrations of lithium, nickel and zinc than those found in meteorites.
Olivine is an abundant mineral, but gem-quality peridot is rather rare due to its chemical instability on Earth's surface. Olivine is usually found as small grains and tends to exist in a heavily weathered state, unsuitable for decorative use. Large crystals of forsterite, the variety most often used to cut peridot gems, are rare; as a result olivine is considered to be precious.
In the ancient world, mining of peridot, called topazios then, on St. John's Island in the Red Sea began about 300 B.C.
The principal source of peridot olivine today is the San Carlos Apache Indian Reservation in Arizona. It is also mined at another location in Arizona, and in Arkansas, Hawaii, Nevada, and New Mexico at Kilbourne Hole, in the US; and in Australia, Brazil, China, Egypt, Kenya, Mexico, Myanmar (Burma), Norway, Pakistan, Saudi Arabia, South Africa, Sri Lanka, and Tanzania.
Data sheet
Product: Natural Onyx, Shape: Round, Color: Black, Size: 3.90 - 4.00 mm, Weight: 0.25 carat, Clarity: Opaque Appearance, Treatment: Treated, Origin: India
Stone type: Natural Topaz, Shape: Oval, Color: Blue, Weight carat: 1.50, Treatment: Improvement treatment, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 8.00x6.00, Sale information: Price by piece
Stone type: Natural Topaz, Shape: Cushion, Colour: White Brown, Stone size mm: 13.20x1.80x9.50, Weight carat: 11.70, Stone Clarity: No visible inclusions
Product name: Natural Opal, Shape: Oval cabochon, Color: White, Stone size: 6.90x5.00 - 7.20x5.30 mm, Weight: 0.50 carat, Stone clarity: No visible inclusions, Treatment: Untreated, Iridescence: Medium, Origin : Ethiopia
Product name: Natural Tourmaline, Shape: Wand, Color: Green, Stone dimensions mm: 15.00x3.90x3.00, Stone Carat Weight: 1.80, Stone clarity: No visible inclusions, Origin: Pakistan
Product name: Natural Topaz, Shape: Cushion, Colour: Light Brown, Stone size mm: 13.70x11.60x9.40, Stone weight carat: 12.30, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Pakistan
Stone type: Natural Topaz, Shape: Baguette, Colour: Blue Swiss, Stone size mm: 9.90x6.20 - 10.10x6.20, Weight carat: 2.65 - 3.00, Stone Clarity: No visible inclusion
Product: Natural Turquoise, Shape: Oval caboson, Color: Blue, Size: 7.70x5.90 mm, Weight: 0.80 carat, Clarity: Opaque, visible inclusions, Treatment: Untreated, Origin: USA
Stone type: Natural Tanzanite, Shape: Oval, Color: Blue, Weight carat: 0.15, Treatment: Heated, Source: Tanzania, Stone Clarity: Eye clean, Stone size mm: 4.00x3.00, Sale information: Price by piece
Product name: Natural Citrine, Shape: Cushion checkerboard, Color: Yellow, Stone size: 13.90x10.10 mm, Weight: 5.90 carats, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Brazil
