This intricate diamond tiara from the estate of the Duchess of Roxburghe, which will be auctioned by Sotheby's Geneva on 12 May, dates back to the last quarter of the 19th century and can also be worn as a necklace (estimate: $306-510,000).

This intricate diamond tiara from the estate of the Duchess of Roxburghe, which will be auctioned by Sotheby's Geneva on 12 May, dates back to the last quarter of the 19th century and can also be worn as a necklace (estimate: $306-510,000).