Vintage 1930s Diamond Engagement Ring in 18k Platinum.  This GIA certified Art Deco engagement ring features a 1.27 carat Old European cut diamond set in platinum over an 18 karat yellow gold band. The dainty shoulders contain a line of diamond accents set inside milgrain borders to add just a little bit more sparkle. From the side profile this ring sits prominently and allows plenty of light into the primary stone.