A ruby and diamond cluster ring

A ruby and diamond cluster ring, the oval faceted Burma ruby weighing 0.66 carats, Gem-A certificate number 128113, set to the centre of an old brilliant-cut diamond-set cluster, all set in white to a yellow gold mount with an old brilliant-cut diamond set on each shoulder, the diamond estimated a total of three quarter of a carat, stamped "Tiffany&Co", hallmarked London, 2013, bearing the Bentley&Skinner sponsormark, gross weight 3.76 grams

No. 21662M