1.86 Old European Cut Diamond Engagement Ring in 14k Yellow Gold1. 86 Old European Cut Diamond Engagement Ring in 14k Yellow Gold. This dreamy diamond engagement ring is sure to impress! Set in 14 karat yellow gold, this By Filigree engagement ring features a 1. 86 carat old European cut diamond set in six prongs. Two (2) . 21 carat baguette diamonds accent the gorgeous center stone. Glitter and fire radiate from the white center diamond, bringing a thoughtful contrast to the warm yellow gold metal. From the