A single stone diamond ring

A single stone diamond ring, the round brilliant-cut diamond weighing 3.04 carats, of H colour, SI1 clarity, GIA 2155586852, ten claw-set to a platinum crown collet, a tapered baguette-cut diamond set to each shoulder, weighing a total of 0.57 carats for the pair, with D-section shank, hallmarked platinum, London 2009, bearing the Bentley & Skinner sponsor mark, gross weight 6.5 grams

No. 20956M