RUBY ART DECO DIAMOND VINTAGE STYLE HALO ENGAGEMENT RING SETTING SEMI MOUNTFeatured here is a alluring ring setting with diamonds and custom cut rubies! 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 bezel.