An 18ct gold aquamarine and diamond ring

the claw set central square faceted aquamarine set within four claws, underbezel and shoulders set with round brilliant cut diamonds, 'D' shaped shank, size O, Birmingham hallmarks for 18ct gold, weight 3.8g, accompanied by a report from W.G.I, dated 05-08-2016, stating the natural aquamarine weight as 2.28ct, colour medium strong blue, clarity loupe clean, origin Brazil with no indication of treatments or heat, diamond stated total weight 0.25ct, colour G-H, clarity VS