not detectable

Your gemstone search

Showing 49–64 of 100 results

  • Spinel

    Spinel

    1,069 ct. | II/B
    64840-1
    €6,800.00
  • Spinel

    Spinel

    1,489 ct. | III/C
    64843-1
    €3,300.00
  • Spinel

    Spinel

    1,121 ct. | III/C
    64844-1
    €4,000.00
  • Spinel

    Spinel

    1,014 ct. | II/C
    64847-1
    €5,400.00
  • Spinel

    Spinel

    1,144 ct. | II/C
    64846-1
    €5,800.00
  • Spinel

    Spinel

    1,067 ct. | II/C
    64852-1
    €5,700.00
  • Spinel

    Spinel

    1,607 ct. | IV/C
    64848-1
    €5,800.00
  • Spinelle

    Spinelle

    3,241 ct. | IV/C
    50943
    €3,600.00
  • Tansanite

    Tansanite

    6,162 ct. | II/A
    61667-2
    €6,200.00
  • Tanzanite

    Tanzanite

    13,589 ct. | II/B
    GLA
    €13,100.00
  • Tanzanite

    Tanzanite

    15,371 ct. | II/A
    GLA
    €16,400.00
  • Tanzanite

    Tanzanite

    15,887 ct. | II/A
    GLA
    €14,500.00
  • Tanzanite

    Tanzanite

    16,457 ct. | II/B
    GLA
    €15,200.00
  • Tanzanite

    Tanzanite

    16,566 ct. | III/A
    GLA
    €15,100.00
  • Tanzanite

    Tanzanite

    17,194 ct. | II/A
    GLA
    €20,500.00
  • Tanzanite

    Tanzanite

    19,216 ct. | II/B
    GLA
    €20,500.00

Facts

properties of tanzanite

  • Belongs mineralogically to zoisite
  • Hardness grade 6,5-7
  • Chemical formula: Ca2Al3(SiO4)3OH
  • Includes the colors blue, violet and brown
  • By heating it develops its famous blue color
  • Density from 3,29 - 3,4

origin

worth knowing

  • Only place of discovery: Tanzania
  • Tanzania locality was discovered in 1967
  • Was mineralogically known as "Zoisite" for a long time
  • Became known worldwide through the movie "Titanic"

Tanzanite as an investment

  • Rare, strongly increasing in value
  • finds become less, because there is only 1 mining area
  • rather bigger stones are preferable
  • Larger stones have higher increase in value
  • stones with deep blue color are to be preferred
close
[cleverreach form=219969]