Platinum & 1.68 Carat Diamond Ring Centering an old European cut diamond weighing a total of 1.45 carats framed by single cut diamonds weighing a total of 0.23 carats. The old European cut diamond has J color, SI1 clarity, and faint blue fluorescence. Platinum & 10% iridium 6 1/4 (size) 0.18 ounces (total weight) Due to the limitations imposed by a mounting, all diamond weights and grades are approximate.