1.01 Art Deco Diamond Engagement Ring in 18K White Gold1. 01 Art Deco Diamond Engagement Ring in 18K White Gold. This Art Deco engagement ring features a 1. 01 carat Round Brilliant cut diamond in 18k white gold. The center diamond has excellent brilliance and fire. The primary stone is set in boxy prongs and is accented by eight . 018 carat diamonds that step down toward the shoulders. The squared outlines of the setting and shoulders give this vintage engagement ring a geometric flair. From the profile,