A late Victorian tourmaline and diamond twin brooch, circa 1890. Photo courtesy Bentley & Skinner

the brooch in the form of a twin heart, set with a pear-shaped cabochon-cut green and a pink tourmaline, estimated to weigh a total of 1.70 carats, both rubover-set to a yellow gold mount, to the centre a diamond cluster surround and ribbon bow surmount, the old brilliant-cut diamonds estimated to weigh a total of 1.50 carats, white claw set to a yellow gold mount, with pendant loop and detachable brooch fitting, gross weight 5.5 grams. Available at Bentley & Skinner.