BSJ-71871/PL. Platinum Cushion-Cut London Blue Topaz Solitaire Ring.
6.00 x 6.00mm London Blue Cushion-Cut Topaz = 1.25 cts.
Mounting: 7.70mm (top) tapering to 1.55mm (bottom of the shank).
Mounting weight: 4.60 grams
Finish: Polished / Rhodium