Unknown origin

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Showing 161–176 of 342 results

  • Rhodolite-Pear

    Rhodolite-Pear

    2,773 ct. | V/A/B
    65010-1
    €500.00
  • Rubellite

    Rubellite

    2,508 ct. | II/C
    GLA
    €650.00
  • Rubellite

    Rubellite

    2,518 ct. | II/C
    GLA
    €650.00
  • Rubellite

    Rubellite

    2,568 ct. | III/C
    GLA
    €500.00
  • Rubellite

    Rubellite

    2,668 ct. | III/C
    GLA
    €650.00
  • Rubellite

    Rubellite

    3,301 ct. | II/C
    GLA
    €1,100.00
  • Rubellite

    Rubellite

    3,309 ct. | II/C
    GLA
    €1,300.00
  • Rubellite

    Rubellite

    3,332 ct. | III/D
    GLA
    €1,200.00
  • Rubellite

    Rubellite

    3,423 ct. | III/C
    GLA
    €1,300.00
  • Rubellite

    Rubellite

    3,691 ct. | II/C
    GLA
    €1,250.00
  • Rubellite

    Rubellite

    3,713 ct. | III/C
    GLA
    €1,400.00
  • Rubellite

    Rubellite

    3,932 ct. | II/C
    GLA
    €1,500.00
  • Rubellite

    Rubellite

    1,773 ct. | III/D
    GLA
    €500.00
  • Rubellite

    Rubellite

    2,116 ct. | III/C
    GLA
    €500.00
  • Rubellite

    Rubellite

    2,055 ct. | III/C
    GLA
    €550.00
  • Rubellite

    Rubellite

    7,007 ct. | III/D
    GLA
    €3,300.00

Facts

properties of tourmaline

  • Separate mineralogical group with many varieties
  • Hardness grade 7 - 7,5
  • Chemical formula: XY3Z6(T6O18)(BO3)3V3W(V, W, X, Y, Z stand for different possible elements)
  • Includes all colors
  • Colored by different metal oxides
  • Specific gravity 2.8 - 3.3 g/cm3

origin

  • Brasilia
  • Madagascar
  • Pakistan
  • Various locations in Europe
  • Mozambique
  • Namibia
  • Nigeria

worth knowing

  • Oldest known locality in modern trade: Brazil
  • Occurs in all colors
  • Forms beautiful crystals with very good crystal endings
  • Various esoteric and healing meanings
  • Also large crystals and large cut stones possible
  • The locality Pakistan was discovered only around 2010

investment in tourmaline

  • Still undervalued compared to other gemstones.
  • Exception: the Paraiba tourmaline, which can be more expensive than sapphire
  • Stones should be at least 5 ct in weight, except for Paraiba
  • Larger stones have higher appreciation
  • Experts calculate 6 - 8% increase in value per year
  • Beautiful, pure stones with clear colors are preferable
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