Pictures taken in direct sunlight. Opal was rare and very valuable in antiquity. In Europe it was a gem prized by royalty. Until the opening of vast deposits in Australia in the 19th century the only known source was Cervenica. Beyond the Roman frontier in Slovakia.The item "Men's Blue Green 100% Natural Australian Opal 13x12mm 10k Yellow Gold, Size 10" is in sale since Friday, June 5, 2020. This item is in the category "Jewelry & Watches\Fine Jewelry\Fine Rings\Gemstone". The seller is "goldschmidtcompany" and is located in Kaneohe, Hawaii. This item can be shipped worldwide.