Art Deco Filigree Diamond Engagement Ring in PlatinumArt Deco Filigree Diamond Engagement Ring in Platinum. This engagement ring features a . 62 carat Old European Cut center diamond on an ornamental, filigree platinum band. The Old European cut, natural diamond has larger facets and a kaleidoscopic pattern and is elegantly matched with single cut accent diamonds on either side of the primary stone. From the shoulders to the under gallery, a lacy filigree design in platinum morphs from abstract swirls