Vintage Art Deco Single Cut Diamond Band in PlatinumVintage Art Deco Single Cut Diamond Band in Platinum. This original Art Deco wedding band features . 18 carats of round cut diamonds set in platinum. The band is set with 9 channel set diamonds across the bridge of the finger, with the channel finishing at a point on each end. The shank below the diamonds has nice rounded grooves to give a bit more dimension.