Antique Edwardian Emerald Diamond Ring in 18k Yellow Gold.  This antique Edwardian engagement ring features a .44 carat step cut emerald and .06 carats of Old Mine cut diamonds finished in 18k yellow gold and platinum. With large, square facets, the step cut emerald has an electric green-blue hue. The emerald is prong set in a lovely square shaped mounting with milgrain details. The center emerald is flanked by two (2) .03 carat Old Mine cut diamonds. The diamonds have a slightly warm hue that complements the warmth from the 18 karat yellow gold band. The Old Mine cut diamonds, with their charming vintage facets, are bezel set in platinum.