Gold and amethyst demi-parure, circa 1820. photo Sotheby's

Est. 7,000—10,000 GBP. Lot Sold 15,625 GBP

Amethyst, pearl and diamond pendant, 19th century. photo Sotheby's

Est. 7,000—10,000 GBP Lot Sold 9,375 GBP

Amethyst and diamond combination jewel and cultured pearl necklace. photo Sotheby's

Est. 4,000—6,000 GBP Lot Sold 8,500 GBP

Amethyst and diamond brooch/pendant, late 19th century. photo Sotheby's

Est. 5,000—7,000 GBP. Lot Sold 8,125 GBP

Amethyst and diamond pendant, circa 1880. photo Sotheby's

Est. 2,000—3,000 GBP Lot Sold 6,500 GBP

Amethyst and diamond brooch. photo Sotheby's

Est. 5,000—6,000 GBP Lot Sold 6,250 GBP

Sotheby's. Jewels. 15 Jul 10. London www.sothebys.com