Indigolite

Item Number: IND-IND-2018-65

2.690

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Details

Price:
2.690
Weight:
6,972 ct.
Color:
dunkel grünlich blau
Shape:
Octagon
Dimensions:
17,64 x 8,05 x 5,32
Purity:
Augenrein (A)
Origin:
Unknown origin
Treatment:
Untreated
Certificate:
GLA47771
Item Number:
IND-IND-2018-65

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

  • Brasilien
  • Madagaskar
  • Pakistan
  • Verschiedene Fundorte in Europa
  • 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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