Can a tanzanite's origin be proven?
Yes, trivially, and it tells you nothing. Every tanzanite is from Merelani, so origin distinguishes no two stones. Traceability is the harder question.
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What we have found out about tanzanite, with the sources attached: how it is found, judged, cut, worn and cared for.
Is all tanzanite heat treated?
Effectively all of it, and it was probably brown in the ground. What the heating does, and why unheated is a premium worth declining.
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My tanzanite is damaged. What can be repaired?
Abrasion polishes out. A chip usually means recutting and losing weight. A clean split along the cleavage plane generally means the stone is finished.
READBuying a loose tanzanite and having it set
Every setting operation puts pressure on a stone with a plane it can split along. Buying loose and commissioning means setting it once.
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What is tanzanite? The stone, the source, the colour
Tanzanite is the violet-blue variety of zoisite, mined commercially in one place on Earth. Its colour is decided as much by the cutter as by the crystal.
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Tanzanite against sapphire and diamond
Tanzanite is geologically rarer than diamond and usually costs less. Both are true, and why they do not contradict each other is the useful part.
READThe other gem from Merelani: tanzanite and tsavorite
One hillside produced two new gemstones in 1967. Both are coloured by vanadium, and one of them is never treated.
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What decides the price of a tanzanite
Colour saturation carries most of the price, size is tangled up in it, and treatment barely moves it. What a quote is really made of, and why this one has none.
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Why tanzanite is found in only one place on Earth
One deposit, about eight square miles, and a formation sequence that had to happen in a particular order. The geology is remarkable without the sales argument.
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What does tanzanite go with? Metals, colours and sets
The one decision that matters is whether your stone reads blue or violet. The rest is preference, and it is offered here as preference.
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