No Image Lot 64 A Mappin and Webb platinum emerald cut diamond ring with GIA certificate. The principal stone is 0. 64A Mappin and Webb platinum emerald cut diamond ring with GIA certificate. The principal stone is 0. Hansons Auctioneers and Valuers A Mappin and Webb platinum emerald cut diamond ring with GIA certificate. The principal stone is 0.32 carat, colour grade G and clarity grade VVS1... Add to watchlist Live