Opal Yellow Gold Stacking Ring SetThe Opal Yellow Gold Stacking Ring features a 16mm x 12mm black opal, set in an 9ct yellow gold rub over setting. Opulent Opal: This Opal Yellow Gold Stacking Ring was made with a client's opal sourced from Australia. We can also source top quality opals for you. As all opals vary we will email you a selection of opals to choose from on ordering. Elegant Yellow Gold Setting: The opal is securely set by an 9ct yellow gold rub over setting onto silver