5x7mm Colombian Emerald Ring, Natural Colombian Emerald Sterling Silver Ring. This Natural Emerald Ring contains a 5x7mm gemstone surrounded by cubic zirconia side stones. This ring is 925 Sterling Silver and Platinum Plated, also available in Gold or Rose Gold Plating. This item includes a gift box and a certificate of authenticity with purchase. Please allow up to 10-15 days for processing and delivery of this item, in many cases your item will be delivered much sooner.