Art Nouveau 2.80 Carat Colombian Emerald & Old Cut Diamond Ring, circa 1900A mesmeric antique emerald ring. The emerald cut emerald in the centre certified as Colombian displays a bright, grassy green. Although there are inclusions in the emerald (which is common), the stone remain bright and vivid. Sixteen old mine cut diamonds surround the centre stone, each in an individual rubover setting, with a further two diamonds nestled in the split shoulders. The unusual vented back hole features decorative hand engraving the sort