Colorful Natural Australian Opal Ring, Sterling Silver Opal Ring with Zirconia. This ring contains natural Australian Opal gemstones that measure 3x5mm, and cubic zirconia side stones. This ring is 925 sterling silver and available in 3 color options: silver (platinum plated), 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.