The ring is marked PT950 for 95 % platinum. It weighs 8.7 grams . Set completely aroung the ring is 52 round brilliant cut natural diamonds with an approx total weight of .75 cts. The diamonds are SI1 to SI2 and H to I in color. The band is 1/4" wide and wears to a size 7.25. It cannot be resized. The ring was made around 75 years ago.