Colombian Emerald Ring 4x6mm 925 Sterling Silver Emerald Ring, Natural Emerald. This ring contains one natural Colombian Emerald measuring 4x6mm. This ring is 925 sterling silver and available in the following color options: Platinum Plated (Silver), Gold, and Rose Gold Plating. This item includes a gift box and a certificate of authenticity with purchase. This item is made to order, please allow up to 10-15 days for processing and delivery of this item.