Rings › 18ct. Yellow Gold Opal and Synthetic Ruby Ring Image 1 of 3 Image 2 of 3 Image 3 of 3 18ct. Yellow Gold Opal and Synthetic Ruby Ring £595.00 Pre-ownedFinger Size: K (All rings can be sized to fit). Quantity: Add To Cart Added! Pre-ownedFinger Size: K (All rings can be sized to fit).