• NATURAL BICOLOR AFGHANISTAN TOURMALINE GEM STONE

    A very nice bi-colour Tourmaline Gemstone Color: wide color range, green, blue, yellow, pink, red, brown, colorless. Bi-color is common. Hardness: 7 - 7.5 Refractive index: 1.61 - 1.66 Density: 3.01 - 3.25 Chemical composition: (NaLiCa)(Fe11MgMnAl)3Al6((OH)4(BO3)3Si6O18) Crystal structure: trigonal Origins: Brazil, Madagascar, Namibia, Zambia, Sri Lanka, Russia, USA, Afghanistan. Tourmalines exist in different colors and are known for their bi-color or even tri-color varieties. The most expensive color varieties are intense green, blue and red.Heat treatment is occasionally applied to enhance the color of green or blue crystals. Yellow stones could be irradiated to improve their color or clarity.
    AU $49.00
    0 bids
    AU $23.50 postage
    Ending Saturday at 23:29 AEDST5d 1h
    or Best Offer
  • Bi Tourmaline Octagon 4ct Pink and Colorless 15x5.5mm VS Loose Natural Gemstone

    Size : 15x5.5mm or 5.5x15mm (can be used in 6x15mm or 15x6mm settings). This Bi-Tourmaline is sparkling light pink from one end and colorless from another end. The gemstone is eye clean. Color : Pink and Colorless.
    AU $590.00
    AU $21.10 postage
  • 4.00Carat Natural Bi Color Tourmaline Gemstone 14X9X3mm Faceted Emerald Cut S919

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    AU $57.99
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