A sapphire and diamond cluster ring, the oval blue Ceylonese sapphire of known weight 18 carats, surrounded by eighteen round brilliant cut diamonds on diamond set shoulders. Estimated total diamond weight 1.60 carats. 18ct yellow gold. Weight 10.59 grams. Size O. Accompanied by GSL Gemstone Authentication report AA57655 stating natural blue sapphire, no evidence of heat treatment identified.