Three stone ring designed by John David Cooney has natural diamonds set in Platinum Hard. Platinum Hard is 950PT and 50 Gallium and Ruthenium now having a hardness of 180 Vickers
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Three stone ring designed by John David Cooney has natural diamonds set in Platinum Hard. Platinum Hard is 950PT and 50 Gallium and Ruthenium now having a hardness of 180 Vickers