The Rosebery pearl diamond parure @ Christie's London

An historic pearl and diamond tiara. Photo: Christie's Images Ltd. 2011

Designed as a series of six bouton-shaped natural pearls and old-cut diamond clusters, interspersed by diamond florettes to the seven detachable graduated drop-shaped natural pearl and diamond surmounts, the pearls measuring, converts to form a series of six brooches, circa 1878, inner circumference 29.7cm, in fitted case by R&S Garrard & Co., Haymarket, London. Estimate  £1,000,000 - £1,500,000 ($1,635,000 - $2,452,500). Price Realized  £1,161,250 ($1,898,644)

Accompanied by report no. 59425 dated 20 April 2011 from the SSEF Swiss Gemmological Institute, relating to the testing if a selection of pearls, stating that one bouton and seven drop shaped pearls were found to be natural, saltwater

The property of a private collector

An historic pearl and diamond bracelet and brooch. Photo: Christie's Images Ltd. 2011

The bracelet, designed as a series of eight graduated bouton-shaped natural pearls and old-cut diamond clusters to the fine-stone line intersections, mounted in silver and gold, circa 1878, 19.5cm long.

The brooch, mounted with a large bouton-shaped natural pearl to the two row old-cut diamond surround with collet detail to the edge, mounted in silver and gold, with detachable brooch/pendant fittings, circa 1878, 4.3mm wide, bracelet and brooch in fitted case by R&S Garrard & Co., Haymarket, London

Estimate £300,000 - £400,000 ($490,500 - $654,000). Price Realized £577,250 ($943,804).

Accompanied by report no. 59424 dated 20 April 2011 from the SSEF Swiss Gemmological Institute stating that the nine bouton-shaped pearls were found to be natural, saltwater (2)

The property of a private collecto

Christie's . Important Jewels, 8 June 2011, London, King Street  www.christies.com

LONDON.- An auction house worker poses for the photographers wearing the Rosebery pearl diamond tiara, and a matching bracelet and brooch, in central London, Monday, June 6, 2011. The three pieces, that belonged to Hannah, Countess of Rosebery (1851-1890) nee de Rothschild - the granddaughter of Nathan Mayer Rothschild founder of NM Rothschild Sons - the English branch of the Rothschilds banking empire, will go for sale at the Christies auction house London, as part of an auction of Important Jewels on Wednesday June 8, 2011. AP Photo/Lefteris Pitarakis.