Tanzanite

Item Number: 2021-0233

In stock

€18,500.00

incl. 20% VAT

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Details

Weight:

17,414 ct.

Color Quality:

very good (II)

Purity:

Eye clean (A)

Color:

blue

Shape:

Antique rectangle

Dimensions:

16,52 mm x 13,39 mm x 9,62 mm

Origin:

Unknown origin

Treatment:

Untreated

Certificate:

GLA52741

Item Number:

2021-0233

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

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