18 Karat White Gold Opal and Cluster Diamond Ring For Sale at 1stDibs Oval Opal and Diamond Claw Set Cluster Ring 18 Karat White Gold For Australian Black Opal and Diamond Cluster 18 Karat Gold Ring For Sale Vintage 18 Carat Yellow Gold Oval Opal and Diamond Cluster Ring For. Proud to be Family Run Green Handmade Black is the rarest form of opal. And youll catch strong flashes of green and blue when you stare into this 5. 35ct black opal. The mesmerising stone is so striking it doesnt need much else, so we decided to just dress it with a delicate halo of pav set brilliant cut diamonds. Our master goldsmith handcrafted this ring in our onsite workshop, intricately piercing out the under gallery. Specifications: Metal: 18ct Yellow and White Gold Stone weight: 5. 35ct black opal & 0. 35ct diamonds Colour: G H Clarity: SI Current size: UK L1 2 Related Product: 18ct Yellow and White Gold 12. 62ct Green Tourmaline and Diamond Dress Ring