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1. An early 20th century diamond and demantoid garnet caterpillar brooch, estimate £800-1200 at Lawrences of Crewkerne on July 22.

2. A pair of gem-set duck brooches by OJ Perrin modelled as ducks with a cabochon chrysoprase eye, estimate £600-800 at Lyon & Turnbull in London on July 1.

3. A gold and platinum amethyst, cabochon turquoise and diamond brooch-pendant by George Weil, c.1970, centred with an oval faceted amethyst, estimated to weigh 46.14ct, guide £2000-3000 at Lindsay Burns in Perth on July 20-22.

4. An Edwardian diamond and platinum bow brooch-pendant set with a central old cut diamond estimated to weigh 1.17ct, guide £4000-6000 at Dreweatts in Newbury on July 7.