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  • Aquamarine

    Aquamarine

    4,747 ct. | V/B
    GLA
    S$2,449.84
  • Aquamarine

    Aquamarine

    7,044 ct. | V/C
    GLA
    S$2,593.95
  • Aquamarine

    Aquamarine

    6,070 ct. | V/B
    GLA
    S$3,458.59
  • Aquamarine

    Aquamarine

    8,480 ct. | V/B
    GLA
    S$4,899.68
  • Aquamarine

    Aquamarine

    5,574 ct. | IV/B
    GLA GII
    S$3,170.38
  • Aquamarine pair

    Aquamarine pair

    6,767 ct. | V/A
    GLA
    S$3,458.59
  • Bastnäsite

    Bastnäsite

    2,3 ct. | IV/C
    GLA
    S$720.54
  • Beryl

    Beryl

    32,111 ct. | IV/D
    GLA
    S$7,061.30
  • Beryl

    Beryl

    36,711 ct. | III/C
    GLA
    S$10,087.57
  • Blue Sapphire

    Blue Sapphire

    1,579 ct. | VII/C
    GLA
    S$1,729.30
  • Blue Sapphire

    Blue Sapphire

    6,376 ct. | IV/C
    GLA GÜB EGLAB
    S$61,966.48
  • Blue Sapphire

    Blue Sapphire

    6,303 ct. | IV/C
    GLA GÜB CGL
    S$59,804.86
  • Blue Sapphire

    Blue Sapphire

    1,600 ct. | VI/C
    GLA
    S$1,585.19
  • Chrome Tourmaline

    Chrome Tourmaline

    1,846 ct. | IV/D
    GLA
    S$720.54
  • Chrome Tourmaline

    Chrome Tourmaline

    2,902 ct. | IV/D
    GLA
    S$1,152.86

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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