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  • Ruby

    Ruby

    3,672 ct. | IV/E
    GLA
    S$45,394.05
  • Ruby

    Ruby

    4,061 ct. | II/D
    GLA
    S$38,909.19
  • Placeholder

    Ruby

    1,087 ct. | IV/C
    GLA
    S$7,781.84
  • Spinel

    Spinel

    1,94 ct. | IV/B
    GLA
    S$1,873.41
  • Spinel

    Spinel

    2,205 ct. | IV/D
    GLA
    S$1,585.19
  • Spinel

    Spinel

    1,762 ct. | V/B
    GLA
    S$1,441.08
  • Spinel

    Spinel

    1,794 ct. | IV/B
    GLA
    S$2,017.51
  • Spinel

    Spinel

    2,392 ct. | V/C
    GLA
    S$2,161.62
  • Spinel

    Spinel

    9,294 ct. | IV/C
    GLA
    S$27,380.54
  • Tourmaline

    Tourmaline

    8,692 ct. | IV/A
    GLA
    S$4,035.03
  • Tourmaline

    Tourmaline

    16,269 ct. | III/B
    GLA
    S$8,934.70
  • Tourmaline

    Tourmaline

    6,06 ct. | V/D
    GLA
    S$1,441.08
  • Tourmaline

    Tourmaline

    7,19 ct. | IV/A
    GLA
    S$3,602.70
  • Tourmaline

    Tourmaline

    13,471 ct. | V/A
    GLA
    S$6,628.97
  • Tourmaline

    Tourmaline

    12,282 ct. | V/A
    GLA
    S$5,332.00
  • Tourmaline

    Tourmaline

    11,516 ct. | III/C
    GLA
    S$4,611.46

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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