A vintage five stone Diamond RingAn antique five stone ring dating from the early 20th century, set with old brilliant cut white diamonds. The stones graduate across the finger: a 4 mm centre diamond, flanked by 3 mm stones, and 2. 7 mm diamonds at each end. The total diamond weight is estimated at 0. 60 carats, with colour grades IK and SI clarity The diamond head is platinum, measuring 16 4 mm with a depth of 4. 5 mm. The shank tests as 18 carat yellow gold, weighing 2. 2 grams