Cushion

Your gemstone search

Showing 1–16 of 64 results

  • Alexandrite

    Alexandrite

    1,272 ct. | VII/C
    GLA
    €1,500.00
  • Alexandrite

    Alexandrite

    1,051 ct. | IV/C
    63669-1
    €9,700.00
  • Aquamarine

    Aquamarine

    3,903 ct. | V/A
    GLA
    €1,100.00
  • Aquamarine

    Aquamarine

    4,418 ct. | V/A
    GLA
    €1,500.00
  • Bastnäsite

    Bastnäsite

    3,878 ct. | IV/D
    GLA
    €1,000.00
  • Bastnäsite

    Bastnäsite

    2,78 ct. | IV/C
    GLA
    €600.00
  • Blue Sapphire

    Blue Sapphire

    11,069 ct. | V/D
    GLA GÜB CGL
    €47,500.00
  • Blue Sapphire

    Blue Sapphire

    12,657 ct. | V/C
    GLA GÜB CGL
    €53,000.00
  • Blue Sapphire

    Blue Sapphire

    5,072 ct. | II/C
    GLA GÜB GII
    €66,000.00
  • Blue Sapphire

    Blue Sapphire

    9,528 ct. | V/D
    GLA GÜB CGL
    €33,000.00
  • Blue Sapphire

    Blue Sapphire

    7,727 ct. | V/D
    GLA GÜB CGL
    €27,500.00
  • Blue Sapphire

    Blue Sapphire

    19,337 ct. | VI/E
    GLA GÜB CGL
    €44,000.00
  • Blue Sapphire

    Blue Sapphire

    5,548 ct. | IV/E
    GLA GÜB CGL
    €27,000.00
  • Blue Sapphire

    Blue Sapphire

    1,625 ct. | VI/D
    GLA LGL
    €1,300.00
  • Blue Sapphire

    Blue Sapphire

    6,101 ct. | V/C
    GLA
    €19,000.00
  • Chrome Tourmaline

    Chrome Tourmaline

    1,744 ct. | IV/C
    GLA
    €600.00

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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