Indigolite

Item Number: IND-GREBLU-2019-37

€400

incl. 20% VAT

In stock

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Details

Price:

400 €

Weight:

3,008 ct.

Color:

grünlich blau

Shape:

Octagon

Dimensions:

10,18 mm x 6,75 mm x 5,05 mm

Purity:

very small inclusions (C)

Origin:

Unknown origin

Handling:

not detectable

Certificate:

GLA49617

Item Number:

IND-GREBLU-2019-37

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