Antique Burma Ruby Diamond 18 Karat Yellow Gold Ring Beautiful Antique Burma Ruby Diamond ring is circa Late 1800's- Early 1900's. The colorful 2.85 carat oval shape Burma ruby has been certified by the AGL. The ruby is of Burma origin and features minor heat residue-see report 1095241. The ruby is surrounded by 14 Old Mine Cut Diamonds that equal approximately .70 carat total weight. The ring is currently size 7 (can be sized), and the top measures 11 x 13.5mm.