This is a Natural Chrysoberyl NOT HEAT TREATED with a certificate confirming this and the size which is 13.89 carats weighed. It is a lovely cushion cut stone with 3 small diamonds on each shoulder mounted in platinum with 18 carat yellow gold setting and band. The setting measures 16.16 mm x 13.63 mm and the ring size is N but we have a superb jeweller who can resize without a trace