Antique 2.84 European Diamond Engagement Ring 20k.  This wonderful Art Deco solitaire engagement ring features a 2.84 carat Old European cut diamond and is set in 20 karat white gold. The ring is full of small details that together give it a charming yet impressive look. The center stone is set with a line of milgrain on the inside and the outside of the bezel, with chevron engravings running horizontally just below. There are even more chevron engravings running down all three edges of the shoulders. This ring is a terrific example of Art Deco craftsmanship and of how small details can make all the difference in fine jewelry.