.80 Art Deco Old European Diamond Engagement Ring in Platinum.  This Art Deco engagement ring features a .80 carat Old European cut diamond and .12 carats of single cut accent diamonds in platinum. The bright and glittering Old European cut diamond is set in a square shaped mounting. Unique engravings and six (6) .02 carat accent diamonds decorate the shoulders of the band. From the profile, a decorative vintage basket mounting holds the center diamond, complete on a stylish and engraved platinum band.