Unlike many well-known gems that have been in use for centuries, tanzanite’s history is relatively modern.
The common story of tanzanite’s discovery tells of Maasai herders who found blue crystals in the Merelani Hills near Arusha, Tanzania, while tending livestock in 1967. They notified a prospector named Manuel d’Souza, who promptly registered claims with the government to begin mining.
Initially, d’Souza thought he was mining sapphire, but the crystal was soon identified as a vibrant blue variety of zoisite – a mineral that had been around since the early 1800s.
An estimated two million carats of tanzanite were mined before the Tanzanian government nationalized the mines in 1971. The government divided the mines into four sections, or blocks, in 1990. TanzaniteOne Mining Ltd., the world’s largest tanzanite producer, holds the rights to Block C, which is larger than the other blocks combined.
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