The Tosca ring is a stunning VintageDiamondRing.com vintage emerald engagement ring featuring a natural 2.01 carat natural Colombian GIA square cut emerald flanked by two 1970s vintage shield cut diamonds, weighing .90 carats. Beautifully crafted in platinum, this is a perfect alternative engagement ring. The ring measures 15.2 mm at the top (emeralds and diamonds), and tapers to 1.8 mm at the bottom. Size 6.