Tourmaline

Name: Tourmaline
SKU: TUR-BLUGRE-2019-35
Price: 500.00 EUR
Availability: InStock

Item Number: TUR-BLUGRE-2019-35

€500,00

incl. VAT

In stock

Price:

500,00 €

Weight:

4,078 ct.

Color:

bluish green

Shape:

Octagon

Dimensions:

8,72 mm x 8,16 mm x 6,3 mm

Color Quality:

Medium (VI)

Purity:

very small inclusions (C)

Origin:

Unknown origin

Treatment:

not detectable

Certificate:

GLA49615

Item Number:

TUR-BLUGRE-2019-35

facts

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

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