.86 Art Deco Diamond Engagement Ring in Platinum.  This vintage Art Deco engagement ring features 1.14 carats of diamonds set in shimmering platinum. The primary diamond weighs .86 carats and is set in four (4) platinum prongs. Radiant and highly brilliant, the center diamond has a soft warm hue and is accented by .09 carat diamonds on the shoulders of the ring. From the profile, the ring has a sleek basket mounting, finished in polished platinum.