Diamond mining in Tanzania is a cornerstone of the nation’s minerals sector, even though it often stands in the shadow of the country’s rich gold deposits. Over the decades, Tanzania has emerged as one of Africa’s leading sources of gem‑quality stones, and the government continues to position the industry as a catalyst for regional development.

The best‑known operation is the Williamson diamond mine—locally called the Mwadui diamond mine—about 160 km southwest of Mwanza in Shinyanga Region. Since its discovery in 1940, this single kimberlite pipe has produced millions of carats and remains the largest open‑pit diamond mine in Tanzania. Majority‑owned and managed by Petra Diamonds in partnership with the Government of Tanzania, Williamson is celebrated for yielding rare pink diamonds alongside its steady output of clear, high‑value stones.

Beyond Williamson, several smaller diamond mines in Tanzania and ongoing exploration projects contribute to the country’s reserves. Activity around the historic Lupa Goldfield has revealed diamond‑bearing gravels, while recent licences in the Lake Victoria zone signal fresh investor interest in untapped kimberlite targets. Together, these deposits confirm that high‑quality diamond in Tanzania is not confined to a single site, but is instead distributed across multiple geological belts awaiting responsible development.

With reforms streamlining mining licences and emphasising community benefits, the outlook for Tanzania’s diamond sector is bright. As new operators join established players, the nation is poised to enhance transparency, grow local skilled jobs, and position its diamond mines as pillars of sustainable economic growth—ensuring that the story of Tanzania’s diamonds continues to shine on the world stage.