Emerald and diamond tiara
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'Magnificent and noble' rare jewels shown off before auction

12 April 2011 Last updated at 11:07 BST

A collection of rare jewels, including an emerald and diamond tiara once owned by a Russian Princess, is going up for sale at Sotheby's.

The collection dates from the nineteenth century and includes a pink diamond ring which could sell for up to ten million pounds.

Tiaras, rings, brooches and necklaces to be auctioned went on show in New York this week.