Reference: TUU17
Product name: Natural Tourmaline, Shape: Oval, Color: Pink, Stone dimensions: 5.60x4.80 mm, Weight: 0.55 carat, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Afghanistan
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Tourmaline is a semi-precious crystal with a variable chemical structure, a complex silicate of aluminum and boron. Instead of aluminum atoms, atoms of sodium, calcium, magnesium, iron, lithium, etc. can be substituted in various proportions, causing variations in the physical properties of the crystal. Tourmaline is part of the minerals with the trigonal crystallization system. The chemical formula shows that hydroxyl ions (-OH) and fluoride ions (-F) can combine in different mixing ratios with metals, this mixture determining the color and hardness of the mineral (between 7 and 7.5).
Tourmaline colors are very varied, from blue, green, red, pink, brown, to black, sometimes a crystal can have several colors; in cross section some crystals appear as agate with concentric circular lines of different color. In tourmalines, the phenomenon of pleochroism can often be observed, i.e. the change of color depending on the direction of observation. The most common pleochroism is blue to black.
Another property of tourmaline crystals is piezoelectricity, which is manifested by the electric polarization of the crystal as a result of a mechanical action (pressure or torsion) applied on a certain axis of it. Also, most varieties of tourmaline also show the property of pyroelectricity, that is, the appearance of an electrical polarization following heating or cooling of the crystal. Tourmaline is the first material in which these two properties have been observed.
The term tourmaline has its origin in the Sinhalese word (the majority language spoken in Sri Lanka) turamali, meaning "ash-attracting stone", which reflects the pyroelectric properties of tourmaline.
Data sheet
Product name: Natural Tourmaline, Shape: Oval, Color: Pink, Stone dimensions: 5.60x4.80 mm, Weight: 0.55 carat, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Afghanistan
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: Natural Onyx, Shape: Oval cabochon, Color: Black, Size: 8.00x6.00 mm, Weight: 1.10 - 1.40 carats, Clarity: Opaque Appearance, Treatment: Treated, Origin: India
Product: Natural Onyx, Shape: Oval, Color: Black, Size: 10.00x8.00 - 10.20x8.10, Weight: 2.00 carats, Clarity: Opaque Appearance, Treatment: Treated, Origin: India
Product name: Natural Spinel, Shape: Pear, Color: Dark Bordeaux, Stone dimensions mm: 11.30x8.00, Weight carat: 2.65, Stone clarity: No visible inclusions, Treatment: Untreated, Origin: Sri Lanka
Product: Natural Zircon Lot, Shape: Round, Color: Light Yellow, Size: 4.00 mm, Weight: 1.15 carats, Clarity: No visible inclusions, Treatment: Untreated, Origin: Sri Lanka
Product: Natural Onyx, Shape: Oval, Color: Black, Size: 10.00x8.10 - 10.20x8.30 mm, Weight: 2.75 carats, Clarity: Opaque Appearance, Treatment: Treated, Origin: India
Product Name: Natural Tourmaline, Shape: Oval, Color: Dark Brown, Stone Dimensions mm: 11.60x9.00x6.20, Stone carat weight Weight: 3.85, Stone Clarity: No Visible Inclusions, Treatment: Untreated, Origin: Sri Lanka
Product: Lapis Lazuli, Shape: Oval cabochon, Color: Blue, Size: 18.90x11.80 mm, Weight: 10.70 carats, Clarity: Opaque, Treatment: Untreated, Origin: Afghanistan
Stone type: Natural Smoky Quartz, Shape: Princess, Color: Brown, Stone size mm: 3.70x3.90 - 4.10x4.10, Weight carat: 0.25, Stone Clarity: Eye clean
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: Natural Topaz, Shape: Baguette, Color: London Blue, Size: 10.20x8.20x5.80 mm, Weight: 4.45 carats, Clarity: No visible inclusions, Treatment: Treated, Origin: Brazil
Stone type: Natural Opal, Shape: Marquise cabochon, Colour: White, Stone size mm: 7.80x4.00 - 8.00x4.10, Weight carat: 2.50, Source: Ethiopia, Stone Clarity: No visible inclusions, Iridescence: Strong
Product: Natural cultured pearl, Shape: Round, Color: White, Size mm: 8.10, Weight grams: 0.60, Pearl type: Button, Processing: Semi-drilled, Symmetry: Irregular
Stone type: Natural Topaz, Shape: Emerald, Color: Blue, Stone size mm: 8.00x6.00 - 8.10x6.10, Weight carat: 1.70 - 2.00, Stone Clarity: Eye clean, Treatment: Improvement treatment, Source: Brazil
