DiamondBuzz
Newfield Resources Set to Partner with ACA Resources for Sierra Leone’s Tongo Diamond Mine
Agreement to manage Tongo diamond deposit operations could lead to a sustainable long-term partnership aimed at producing high-quality diamonds.
Australian mining company Newfield Resources is on track to bring in a new partner for its Tongo diamond deposit in Sierra Leone. Newfield has entered into a non-binding term sheet with ACA Resources, another Australian-based miner, to oversee the mine’s operations.
If the deal is finalized before June, ACA will assume control of all mining activities at Tongo, charging Newfield a fee per carat of diamonds produced. Both companies are committed to making the Tongo mine a long-term, sustainable producer of high-quality diamonds in Sierra Leone.
Newfield acquired the Tongo mine in March 2018 for $23.6 million through its purchase of London-based Stellar Diamonds. Prior to Newfield’s acquisition, the mine was owned by Israeli businessman Beny Steinmetz, through Koidu Holdings, where he held a controlling stake.
In May 2022, the first diamond sales from Tongo, totaling 5,200 carats, earned an average price of $262 per carat. Since then, Newfield has invested $80 million into the mine, including the construction of 2 kilometers of underground infrastructure. The mine is expected to have an eight-year life, with peak annual diamond production estimated at 260,000 carats by the fifth year of operations.
DiamondBuzz
CVD Synthetic Fashioned To Imitate A Rough Natural Diamond
The Near-Colorless Stone Is Believed To Be The First Time Creators Of A Synthetic Chemical Vapor Deposition (CVD) Diamond Have Shaped It To Resemble A Rough Diamond
The 6.87-carat near-colorless CVD diamond was shaped to resemble a natural rough octahedral crystal but showed distinct synthetic features under microscopic and spectroscopic analysis.GIA’s tests confirmed the stone’s synthetic origin, noting polishing marks, facet junction roughness, and luminescence patterns inconsistent with natural diamonds.
No evidence currently suggests widespread substitution of synthetics for rough natural diamonds, but existing detection tools could be adapted if such cases increase.
The near-colorless stone is believed to be the first time creators of a synthetic chemical vapor deposition (CVD) diamond have shaped it to resemble a rough diamond, according to an article in the spring issue of the institute’s Gems & Gemology quarterly journal.
Upon investigation with the use of raman spectroscopy, the results confirmed that the material was a diamond, with its near-octahedral shape similar to that of a natural rough crystal. Further analysis showed that it was not a true octahedron, as only one set of opposing faces was parallel. Microscopic observation under differential interference contrast revealed extremely flat faces marked mainly by parallel polishing lines, unlike the growth steps and trigons typically seen on natural octahedral faces. The facet junctions were extremely rough, possibly due to measures taken to improve the color, after which the main faces appear to have been repolished, the institute explained.
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