For several months already a supply of blue cobalt-bearing spinel has been appearing in the gem trade, including some stones of remarkable size -up to 40 carats- and quality.
According to source of the new find is a deposit located about 20 kilometres south-east of Mahenge, Tanzania
According to information from reliable sources, the source of the new find is a deposit located about 20km south-east of Mahenge, Tanzania, which for more than 20 years has been known for its red to pinkish red spinel of exceptional quality.
The stones come from a deposit close to Mahenge and have been on the market for several months.
“These blue crystals had superb colour saturation that rivaled the Luc Yen material, but we were still shocked to receive the lab reports that stated they were indeed ‘Cobalt Spinel’,” said Barber.