This gilded, enameled turban ornament is from 19th Century Persia. On the front, the central panel depicts foliage and is surrounded by diamonds. The plumed crown has rubies, emeralds, and is bordered in blue enamel, fringed with pearls. The reverse side is enameled in green, blue, pink, and gold, and also fringed with pearls and a flower. Sotheby’s is estimating the price at 40,000 to 60,000 GBP.

This rare ruby and diamond tiara comes from the Ottoman Empire, Turkey, c. 1800. Its openwork frame supports a large diamond floral rosette in the center surrounded by diamond petals and floral sprays. On top, the crown boasts a star and crescent. Estimated price: 30,000 to 40,000 GBP.