.31 Art Deco Aquamarine Engagement Ring in White Gold.  This beautiful Art Deco engagement ring features a .31 carat round cut aquamarine set in 14 karat white gold. Full of filigree engravings, this ring has beautiful lines running down the shoulder. The aquamarine is held by four (4) flat prongs in a smooth octagonal section. This is a very special vintage ring for someone looking for an alternative gemstone to a diamond.