Cushion

Your gemstone search

  • Emerald

    Emerald

    3,720 ct. | II/D
    GLA GÜB GII
    S$64,128.10
  • Hessonite

    Hessonite

    21,087 ct. | IV/D
    GLA NGL
    S$1,873.41
  • Peridot

    Peridot

    9,357 ct. | III/D
    GLA
    S$3,890.92
  • Peridot

    Peridot

    7,325 ct. | IV/D
    GLA
    S$2,305.73
  • Peridot

    Peridot

    3,659 ct. | IV/C
    GLA
    S$864.65
  • Peridot

    Peridot

    8,362 ct. | IV/C
    GLA
    S$2,738.05
  • Peridot

    Peridot

    4,687 ct. | III/C
    GLA
    S$2,017.51
  • Pink sapphire

    Pink sapphire

    1,555 ct. | V/D
    GLA
    S$1,729.30
  • Pink sapphire

    Pink sapphire

    1,646 ct. | IV/D
    GLA
    S$2,161.62
  • Pink sapphire

    Pink sapphire

    1,552 ct. | V/C
    GLA
    S$2,161.62
  • Pink sapphire

    Pink sapphire

    7,124 ct. | V/D
    GLA
    S$18,734.05
  • Purple sapphire

    Purple sapphire

    1,697 ct. | V/D
    GLA
    S$2,017.51
  • Purple sapphire

    Purple sapphire

    1,954 ct. | V/D
    GLA
    S$2,305.73
  • Purple Sapphire

    Purple Sapphire

    2,254 ct. | IV/D
    GLA
    S$1,729.30
  • Rubellite

    Rubellite

    3,332 ct. | III/D
    GLA
    S$1,729.30
  • Rubellite

    Rubellite

    2,609 ct. | III/C
    GLA
    S$864.65

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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