Rocks Vintage Collection Art Deco Platinum Diamond and Emerald Ring with a Asscher Cut Centre Emerald in a Bezel Setting. Surrounded by a Halo of Pave Set Diamonds Emerald is a specimen of the mineral bery, it is the most valuable beryl. Emerald is the birthstone for May. Emerald is a medium or darker green to blue-green color gemstone. Approximate Emerald Carat Weight: 1.00ct Approximate Diamond Carat Weight:1.00ct