In examining the supposedly cobalt diffused spinels, GIA researchers discovered high concentrations of nickel, consistent with diffusion treatment. The treatment with nickel, not seen before by GIA or reported in gemological literature, caused the development of a blue-to green colour in pale-coloured spinel and was accompanied by artificial healing of fractures resulting from the heating process.
This story is from the January - February 2023 edition of Diamond World.
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This story is from the January - February 2023 edition of Diamond World.
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