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
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