An opal and diamond brooch-pendant, circa 1905. Photo Bonhams

The oval cabochon opal within a millegrain-set surround of single-cut diamonds, interspersed by three collet-set old brilliant-cut diamonds at each cardinal point, diamonds approximately 0.90 carat total, detachable brooch fitting deficient, length 3.6cm. Sold for £8,125

Bonhams. Fine Jewellery, 25 Apr 2012. London, New Bond Street www.bonhams.com