Unique, viking-style opal ring set in solid 14k yellow gold and black sterling silver. Delicate gold-silver ring with a genuine Australian semi-black opal gemstone. Wonderful as an opal promise ring and engagement ring. Wear it alone or stacked with other rings. Also a truly unique gift for your 12th and 14th wedding anniversary. Opal is also an October birthstone. The gemstone is a genuine Australian opal, mined in Queensland. The boulder opal was cut into an organic drop shape, and in sunlight the gem shows an amazing green and red color play. The gemstone measures about 11.6x6mm, and is safely held by a 4-prong gold setting. Both the opal band and matching wedding band are. Made from sterling silver, with solid 14k gold accents that will not wear off but stay gorgeous forever. You will receive the same opal ring shown in the photos, in an elegant jewelry box and ready to be given as a gift. The matching wedding band will be made to order in the size of your choice. Please note: the black oxidation will wear lighter over time, but can be easily restored at home.