Tanzanite

Tanzanite belongs to the mineral species zoisite. The name was given by Abraham Werner in 1805 after Baron von Zois, who first found the mineral zoisite in the Alps. Green and brown zoisites should be traded as “green and brown zoisites”, not “green tanzanites”.

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Tanzanite, Tanzania (22.85 ct)

  • Class: Silicates

  • Genesis: Metamorph

  • Colours: blue-violet, blue, violet

  • Hardness: 8 (Due to its good cleavage, this stone is difficult to cut.)

  • Main deposits: Tanzania

Tanzanite is named after the found land of Tanzania, where it was found in 1967 in the Merelani Mountains in the Lelatema District and this area is the only mining area to date.

The color can be changed from brown-blue to blue by heating, which is what nature has done in many cases with tanzanites, which occur at excavation depths of less than 700 meters. Unfortunately, explosive material has to be used at such depths, which is critical for the acquisition of larger rough stones in the case of the easily fissile tanzanite. Tanzanite is colored blue by the element vanadium, interestingly vanadium is the cause of green, not blue, in many other minerals. Tanzanite is one of the most difficult gemstones to cut.

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Procedure for investing in a colored gemstone from DEH

1. Advice

Based on our comprehensive financial expertise, we create your individual gemstone portfolio together with you.
This ensures that your gemstone investment is optimally integrated into your existing investment portfolio.

2. Purchase
We acquire your desired colored gemstones internationally, as close as possible to the mines in the respective countries of origin.
3. Opinion

Independent, external renowned laboratories create a gemological and value-determining report on your investment for each individual gemstone.

4. Delivery / Handover

You can choose to hand it over in person at the DEH office, transport your valuables home or store them in a duty-free warehouse.

Of course, you will always be kept up to date by us about all steps.

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