Tanzanite

Item Number: 2020-0146

€8.700,00

incl. VAT

In stock

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Details

Price:

8.700,00 €

Weight:

10,279 ct.

Color Quality:

very good (III)

Purity:

Eye clean (A)

Color:

violet-blue

Shape:

Oval

Dimensions:

15,48 mm x 11,66 mm x 7,6 mm

Origin:

Tanzania

Treatment:

not detectable

Certificate:

GLA49847-2

Item Number:

2020-0146

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

Tansania

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