Reference: OPU14F
Product name: Natural Opal, Shape: Oval cabochon, Color: White, Size: 16.30x9.80x8.90 mm, Weight: 8.15 carats, Stone clarity: Opaque appearance, Inclusions barely visible, Treatment: Untreated, Iridescence: Strong, Origin: Ethiopia
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Opal (from Latin opalus which probably comes from Sanskrit upalus = "precious stone") is an exceptional mineral that is only amorphous, being a hydrated silicate with the chemical formula SiO2*nH2O.
As the percentage of water can reach 25% as an amorphous solid body, the opal appears like glass without having a crystalline structure.
The mineral frequently appears in nature as the filling of a vein, or as granules. Opals are very rare, so they are not exploited industrially. Opal has been found on all continents but 97% of opals come from Coober Pedy, South Australia.
Not long ago, significant opal deposits were discovered in the Welo region of Ethiopia
The color of the mineral is very variable, from colorless to grey, red, brown, yellow, rarely due to some impurities, orange or reddish copper (called "fire opals").
The expression "opalescence" is a fascinating play of colors, which is formed by the phenomenon of light interference caused by the microcrystals of the mineral, a phenomenon found in the Cristobalite or Tridymite quartz variants, both variants are a quartz transformed at high temperatures of over 1470 °C.
The variant of "wood opal" is formed by the phenomenon of impregnating wood with silicates
Hydrophane or "water opal" exhibits a play of light colors similar to water.
Opal in Roman culture was considered the "stone of love" or the "stone of hope".
Data sheet
Product name: Natural Opal, Shape: Oval cabochon, Color: White, Size: 16.30x9.80x8.90 mm, Weight: 8.15 carats, Stone clarity: Opaque appearance, Inclusions barely visible, Treatment: Untreated, Iridescence: Strong, Origin: Ethiopia
Stone type: Natural Topaz, Colour: London Blue, Shape: Round, Stone size mm: 4.80 Weight carat: 0.46 - 0.52, Stone Clarity: Eye clean, Treatment: Improvement treatment
Stone type: Natural Topaz, Shape: Round, Color: Blue, Weight carat: 0.10 - 0.35, Treatment: Improvement treatment, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 2.80 - 4.00, Sale information: Price by piece
Stone type: Natural cultured pearl, Shape: Round, Color: Champagne, Treatment: Untreated, Additional details: Hi quality stone, Stone size mm: 9.50 - 10.20, Sale information: Price by piece, Pearl type: Button, Processing: Semi-drilled, Symmetry: Good, Weght grams: 1.00 - 1.20
Product name: Natural Spinel, Shape: Oval, Color: Light Blue, Size: 7.90x5.70 mm, Weight: 1.10 carats, Clarity: No visible inclusions, Treatment: Untreated, Origin: Sri Lanka
Product: Natural cultured pearl, Color: Champagne, Shape: Round, Pearl size mm: 7.00 - 7.20, Weight grams: 0.35 - 0.40, Symmetry: Good, Pearl type: Button, Processing: Semi-drilled
Product: Natural Opal, Shape: Oval caboson, Color: White Yellow, Size: 6.00x4.00 mm, Weight: 0.25 carat, Clarity: No visible inclusions, Treatment: Untreated, Origin: Ethiopia
Product name: Natural Spinel, Shape: Octagon, Color: Dark Purple, Size: 6.60x5.40 mm, Weight: 1.30 carats, Clarity: No visible inclusions, Treatment: Untreated, Origin: Sri Lanka
Product name: Natural Garnet and Spinel, Shape: Round, Color: Multicolors, Stone dimensions mm: 4.20 - 4.40, Stone carat weight: 2.02, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Sri Lanka
Stone type: Natural Topaz, Colour: White, Shape: Princess, Stone size mm: 6.00x5.90, Weight carat: 1.25 - 1.45, Stone Clarity: Eye clean, Treatment: Untreated, Source: Brazil
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 Opal, Shape: Oval cabochon, Color: Yellow, Stone size mm: 18.00x11.00x7.50, Stone carat weight: 6.70, Stone clarity: No visible inclusions, Treatment: Untreated, Remarks: Transparent, Iridescence: Strong
Stone type: Natural Peridot, Shape: Round, Color: Light green, Weight carat: 0.05, Treatment: Untreated, Source: Pakistan, Stone Clarity: Eye clean, Stone size mm: 1.90-2.00, Sale information: Price by piece
Product: Natural Aquamarine, Shape: Rectangle, Color: White Bluish, Size: 6.00x4.40 mm, Weight: 0.45 carat, Clarity: Barely visible inclusions, Treatment: Untreated, Origin: Pakistan
Stone type: Natural Garnet, Shape: Oval, Color: Red-burgundy, Weight carat: 1.50, Treatment: Untreated, Source: Mozambique, Stone Clarity: Eye clean, Stone size mm: 8.00x6.00, Sale information: Price by piece
