A ruby and diamond cluster ring

A ruby and diamond cluster ring, the oval-cut ruby estimated to weigh 1 carat surrounded by fourteen round brilliant-cut diamonds estimated weigh 0.4 carats in total, all set in platinum to a gold mount with millegrain finished scalloped edge, later hallmarked 18ct gold London 2015, bearing the Bentley and Skinner sponsor mark, circa 1910, gross weight 2.7 grams.