.40 Art Deco Diamond Engagement Ring in 18K White Gold.  This structured Art Deco engagement ring features a .40 carat Old European cut diamond finished in 18 karat white gold. The center diamond is near colorless and is cut to glitter, even in low light environments. The primary diamond is prong set on a unique, geometric mounting and flanked by two (2) .02 carat accent diamonds. The accent diamonds are set inside two beautiful triangle engravings. From the profile, the gallery of this engagement ring has a classic Art Deco architectural design that melts into the shoulders of the band.