From the collection of the Dukes of Portland comes a gorgeous 1870 diamond and natural pearl brooch once belonging to Winifred, Duchess of Portland (1863-1954).

The great beauty, a leading society figure in her time, wore the exquisite brooch, featuring large and desirable natural pearl drops, for prominent 19th century artist John Singer Sargent in a 1902 portrait sitting.

The duchess also wore this piece to the 1897 Devonshire House costume ball, a celebration of Queen Victoria’s diamond jubilee.

Christie's in London will offer the antique brooch (estimate: £500,000-700,000), along with other important jewellery, Fabergé, old master paintings and sculpture from the family's cache, at auction in a series of four sales beginning on Nov. 29.