A diamond cluster ring

A diamond cluster ring, the central round brilliant-cut diamond, weighing 0.50ct, claw set within a border of ten smaller round brilliant-cut diamonds, weighing a total of 0.20ct, millegrain set, all to a platinum mount with tapering shoulders, hallmarked platinum London 2010, bearing the 'Bentley & Skinner' sponsor mark, gross weight 3.36 grams,

No. 27616V