Pink topaz and peridot brooch

A peridot, pink topaz and diamond brooch, the central cushion shaped peridot measuring 8.4 x 8.7mm flanked by two marquise cut pink topaz with four round cut diamonds surrounding the central peridot, claw set in yellow metal, to a pin fitting, unmarked, surface tests as 18ct, length 38mm, gross weight 4.1 grams