Unknown origin

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Showing 321–336 of 342 results

  • Tourmaline

    Tourmaline

    5,058 ct. | IV/C
    GLA
    €2,400.00
  • Tourmaline

    Tourmaline

    3,841 ct. | V/A
    GLA
    €1,200.00
  • Tourmaline

    Tourmaline

    13,471 ct. | V/A
    53346
    €5,200.00
  • Tourmaline

    Tourmaline

    13,674 ct. | IV/B
    49852
    €4,900.00
  • Tourmaline Cateye

    Tourmaline Cateye

    19,035 ct. | V/G
    GLA
    €1,400.00
  • Tsavolite

    Tsavolite

    3,238 ct. | III/E
    GLA
    €1,100.00
  • Tsavolite

    Tsavolite

    2,010 ct. | IV/C
    GLA
    €3,100.00
  • Tsavolite

    Tsavolite

    4,066 ct. | VI/B
    GLA
    €5,000.00
  • Tsavolite

    Tsavolite

    3,132 ct. | II/C
    64824-1
    €12,000.00
  • Tsavolite

    Tsavolite

    2,046 ct. | II/C
    64825-1
    €7,200.00
  • Tsavorite

    Tsavorite

    3,533 ct. | IV/E
    47691
    €2,100.00
  • Turmaline

    Turmaline

    14,251 ct. | V/C
    GLA
    €5,500.00
  • Verdelite

    Verdelite

    3,018 ct. | IV/C
    GLA
    €500.00
  • Verdelite

    Verdelite

    5,096 ct. | IV/C
    GLA
    €1,100.00
  • Verdelite

    Verdelite

    8,207 ct. | IV/C
    GLA
    €1,700.00
  • Verdelite

    Verdelite

    32,001 ct. | II/A
    GLA
    €13,600.00

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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