1930s Diamond Solitaire Two-Tone Engagement Ring.  This Art Deco engagement ring features a .62 carat old European cut diamond set in 14 karat white and yellow gold. The diamond is set in a lovely white gold square with fishtail prongs and an outer square fixed with milgrain detail to add some shimmer. Down the shoulders begins a remarkable series of filigree work in white gold amidst a split shank of yellow gold. This special vintage ring has a lovely contrast and design that will be loved for many years.