Tanzanians visiting the Minerals Commission pavilion at the 50th Dar es Salaam International Trade Fair (Sabasaba) are gaining important knowledge on how to identify the quality and true value of gemstones, an initiative expected to support transparency and informed decisions in the mining sector.
Through demonstrations involving the Gemmological Torch and other specialised equipment, visitors are learning how experts assess gemstones before determining their market value.
Senior Geologist and Gemologist from the Resident Mines Office in Mirerani, Selemani Khamisi, said gemstone valuation depends on four major factors known as the 4Cs colour, carat, clarity and cut.
He explained that experts use modern tools, including the Gemmological Torch, Head Loupe, Table Lamp and the Government Price Guide, to conduct detailed examinations and establish the quality of gemstones.
“The process helps identify important features such as internal marks, cracks, clarity, colour strength and the overall quality of a gemstone,” Khamisi said.
He said gemstones with attractive colours, better clarity, higher weight and quality cutting generally have greater value in the market.
According to Khamisi, the use of scientific assessment tools has helped improve accuracy in gemstone valuation, reducing challenges that may arise from inaccurate pricing during buying and selling.
Visitors at the pavilion have shown particular interest in Tanzanite both raw and value-added varieties as well as Green Garnet, Tourmaline and Almandite Garnet, which are among Tanzania’s notable gemstones.
Khamisi encouraged citizens, mineral traders and other stakeholders to visit the Minerals Commission pavilion to understand gemstone identification methods and the importance of proper valuation before engaging in transactions.
He said the public education programme is part of broader efforts by the Minerals Commission to promote knowledge, accountability and value addition in Tanzania’s gemstone industry.
