Rings › 18ct Blue Topaz & Diamond Ring Image 1 of 1 18ct Blue Topaz & Diamond Ring £1,150.00 Pre-loved, Art Deco style Ring with a Blue Topaz center stone 0.11crt and Diamond 0.13crt. Quantity: Add To Cart Added! Pre-loved, Art Deco style Ring with a Blue Topaz center stone 0.11crt and Diamond 0.13crt.