Untreated

Your gemstone search

Showing 65–80 of 449 results

  • Blue Sapphire

    Blue Sapphire

    7,223 ct. | IV/D
    GLA
    €56,000.00
  • Blue Sapphire

    Blue Sapphire

    1,245 ct. | V/C
    GLA
    €1,600.00
  • Blue Sapphire

    Blue Sapphire

    3,151 ct. | V/C
    60686-1
    €8,800.00
  • Blue Sapphire

    Blue Sapphire

    2,030 ct. | III/C
    61426-1
    €6,200.00
  • Blue Sapphire

    Blue Sapphire

    1,612 ct. | IV/C
    63764-1
    €4,200.00
  • Blue Sapphire

    Blue Sapphire

    1,644 ct. | IV/C
    63766-1
    €4,200.00
  • Blue Sapphire

    Blue Sapphire

    2,025 ct. | III/B
    61428-1
    €6,000.00
  • Bluesaphhire

    Bluesaphhire

    1,612 ct. | V/C
    GLA
    €2,400.00
  • Bluesapphire

    Bluesapphire

    11,973 ct. | III/C
    GLA
    €Price on request
  • Bluesapphire

    Bluesapphire

    8,072 ct. | IV/C
    GLA
    €63,500.00
  • Bluesapphire

    Bluesapphire

    1,569 ct. | IV/C
    GLA
    €3,400.00
  • Bluesapphire

    Bluesapphire

    1,358 ct. | VI/C
    GLA
    €1,300.00
  • Chrome Tourmaline

    Chrome Tourmaline

    1,846 ct. | IV/D
    GLA
    €500.00
  • Chrome Tourmaline

    Chrome Tourmaline

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

    Chrome Tourmaline

    1,537 ct. | IV/C
    GLA
    €600.00
  • Chrome Tourmaline

    Chrome Tourmaline

    2,329 ct. | IV/D
    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
close
[cleverreach form=219969]