A 4 Carat Vintage Marquise Diamond Engagement Ring. This outstanding vintage diamond ring is centered with one (1) marquise brilliant cut diamond weighing 4.05 carats and set into a six-prong setting. The shoulders of the ring are each accented with one (1), prong set, half moon brilliant cut diamond and one (1), channel/prong set, baguette cut diamond. The side faces of the ring are each accented with eight (8), bead set, round brilliant/single cut diamonds. The ring measures 17.1mm at the…