CALIBRE SAPPHIRE ART DECO DIAMOND ENGAGEMENT RING SETTING VINTAGE STYLE ROUNDFeatured here is a remarkable halo ring setting with diamonds and custom cut sapphires! This beautiful setting was inspired by the Art Deco era and it will be a perfect showcase for any center stone. This setting fits a round stone from 5. 2mm 5. 5mm with about 5. 3mm being ideal. Even though 5. 5mm can fit, it is an aggressive fit and not all setters are able to setting a stone like this as it would require carefully removing some metal around the