Vintage Colombian Emerald & Diamond Cluster Ring, circa 1930An elegant and refined Art Deco emerald ring. The vibrant emerald in the centre has been certified and Colombian and shows evidence of only negligible clarity enhancement (oiling). The stone is internally very clean and displays the slightly bluish green tone one looks for in Colombian emeralds. Twelve high white and bright eight cut diamonds surround the centre in a slightly scalloped, angular surround, which leads to a slender 18k shank. A standout