Natural Opal Oval Estate Vintage MENS Ring. Ring is a size 8. Opal weighs approx 4 carats. Opal measures 15 x 12 mm and is a 100% natural African Opal. The item “10k Large COLORFUL! Natural Opal Oval Estate Vintage MENS Ring” is in sale since Sunday, June 25, 2017. This item is in the category “Antiques\Silver\Sterling Silver (.925)\Flatware & Silverware”. The seller is “blidegold” and is located in Elmira, New York. This item can be shipped to United States.