.88 Old European Diamond Engagement Ring in 14k Yellow Gold. 88 Old European Diamond Engagement Ring in 14k Yellow Gold. A vintage engagement ring from the retro era with a four prong set old european cut diamond weighing . 88 carat. The center stone is flanked with six (6) accent diamonds that enhance the beautiful refraction of light in the center stone. The ring is two tone 14k yellow and 14k white gold. This ring would look great with a diamond eternity wedding band.