Cushion

Your gemstone search

  • Tourmaline

    Tourmaline

    5,035 ct. | IV/C
    GLA
    S$1,441.08
  • Tourmaline

    Tourmaline

    2,294 ct. | V/B
    GLA
    S$720.54
  • Tourmaline

    Tourmaline

    7,247 ct. | V/C
    GLA
    S$2,449.84
  • Tourmaline

    Tourmaline

    5,058 ct. | IV/C
    GLA
    S$3,458.59
  • Tourmaline

    Tourmaline

    3,841 ct. | V/A
    GLA
    S$1,729.30
  • Tourmaline

    Tourmaline

    5,917 ct. | IV/A
    GLA
    S$3,746.81
  • Tourmaline

    Tourmaline

    11,071 ct. | IV/B
    GLA
    S$6,196.65
  • Tourmaline pair

    Tourmaline pair

    4,302 4,102 ct. | IV/B
    GLA
    S$7,205.41
  • Verdelite

    Verdelite

    8,207 ct. | IV/C
    GLA
    S$2,449.84
  • Verdelite

    Verdelite

    5,096 ct. | IV/C
    GLA
    S$1,585.19

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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