Ruby$11,800+1.4%Sapphire$86,000-0.4%Sapphire$11,500+1.8%Emerald$34,000+1.3%Emerald$13,200+2.6%Paraíba Tourmaline$42,000+4.7%Paraíba Tourmaline$13,000+3.1%Spinel$6,200+0.6%Cobalt Spinel$21,000+5.2%
WORLDWIDE LAUNCHFebruary 2027
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Home / Market Guide / TANZANITE

Tanzanite

TANZANITE

One source on Earth

Tanzanite is blue to violet zoisite, found in one place: a small area of the Merelani Hills in northern Tanzania, discovered in 1967. No other deposit is known.

Almost all tanzanite is heated to develop its blue, and that is accepted practice. Stones a top laboratory reports as unheated are exceptionally rare, and only those qualify for Vault Trade; heated tanzanite belongs on Stock Trade, with the heating stated.

SOURCE
Merelani, Tanzania
A single deposit a few kilometres across.
TREATMENT
Almost always heated
Unheated stones are exceptional.
COLOUR
Blue to violet
Deep, saturated blue commands the highest prices.
VAULT TRADE STANDARD

Only the finest tanzanite: deep blue to violet-blue, eye-clean, from 5 ct, unheated, with a top-four laboratory report.

NOT YET LISTEDTanzanite lists on CGEMX when real stones arrive, with real prices.