The spectacular Maria Christina Royal Devant-de-Corsage diamond brooch is expected to achieve $1.5-2 million at Christie's Magnificent Jewels sale in Geneva on 13 May 2015.

The spectacular Maria Christina Royal Devant-de-Corsage diamond brooch is expected to achieve $1.5-2 million at Christie's Magnificent Jewels sale in Geneva on 13 May 2015.