Unknown origin

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Showing 81–96 of 332 results

  • Colorchange Sapphire

    Colorchange Sapphire

    5,316 ct. | VI/C
    GLA
    €4,800.00
  • Colourchange Sapphire

    Colourchange Sapphire

    1,421 ct. | VII/C
    64525
    €600.00
  • Dematoid

    Dematoid

    2,738 ct. | V/F
    GLA
    €2,300.00
  • Dematoid

    Dematoid

    3,146 ct. | V/E
    GLA
    €3,300.00
  • Emerald

    Emerald

    9,173 ct. | IV/E
    GLA GÜB
    €26,000.00
  • Emerald

    Emerald

    4,075 ct. | II/D
    GLA
    €33,500.00
  • Emerald

    Emerald

    5,863 ct. | II/D
    GLA
    €50,000.00
  • Emerald

    Emerald

    5,223 ct. | II/D
    GLA
    €50,000.00
  • Emerald

    Emerald

    4,136 ct. | IV/C
    GLA
    €33,000.00
  • Emerald

    Emerald

    7,935 ct. | IV/D
    GLA
    €50,000.00
  • Emerald

    Emerald

    4,826 ct. | II/D
    GLA
    €44,500.00
  • Emerald

    Emerald

    2,977 ct. | IV/E
    GLA
    €3,700.00
  • Emerald pair

    Emerald pair

    13,333 ct. | III/D
    GLA
    €Price on request
  • Hessonite

    Hessonite

    21,087 ct. | IV/D
    GLA NGL
    €1,300.00
  • Hessonite

    Hessonite

    39,936 ct. | III/C
    GLA
    €6,000.00
  • Indicolite

    Indicolite

    3,077 ct. | IV/C
    GLA
    €800.00

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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