Vintage 3.51ct Burmese sapphire and diamond coronet cluster ring

Vintage 3.51ct Burmese sapphire and diamond coronet cluster ring in 18kt white gold. Centrally set with a 3.51ct oval mixed cut Burmese sapphire with no indications of heat treatmentin a claw setting, surrounded by a row of round brilliant cut diamonds in claw settings, to an oval cluster design with curving claws and linear openwork gallery, flanked to either side with raised inwardly tapering shoulders which flow to a solid shank. Marked 18kt gold. Accompanied by SSEF certificate.