Pearl and diamond brooch, Buccelatti, 1960s. photo Sotheby's

Of spray design, set with baroque pearls of grey tint and lasque-cut diamonds, the leaves of textured two tone gold, signed Buccellati, case. Est. 4,000—6,000 GBP. Hammer Price with Buyer's Premium:  4,750 GBP

Quartz, coral and cultured pearl brooch, Buccelatti, 1960s. photo Sotheby's

Set with a mixed-cut smokey quartz to a surmount designed as a stylised scallop shell decorated with a coral branch and articulated cultured pearl drops of various tints, signed Buccelatti, assay and maker's marks. Est. 1,000—1,500 GBP. Hammer Price with Buyer's Premium:  2,750 GBP.

Sotheby's. Jewels. 15 Dec 09. London www.sothebys.com