Antique Shamrock Brooch set with Diamonds & Demantoid Garnets

Antique shamrock brooch set with diamonds and demantoid garnets in yellow gold. Set with three estimated 0.52ct pear shape Old cut diamonds in claw settings, centred with an estimated 0.26ct round Old European cut diamond in a raised claw setting, each pear shape diamond framed by a row of round mixed cut demantoid garnets in silver cut down settings, to a shamrock motif with curving claws scalloped edging and demantoid garnet set stem, fitted to the reverse with a screw-on removable hinged pin with security latch.