Vintage 18ct Blue Zircon & Diamond Cluster Ring

Vintage circa 1950's circular cluster ring set with a central round mixed cut blue zircon measuring 8mm with a surround of ten brilliant cut diamonds.  Each diamond weighing an estimated 0.07ct.  Total diamond content estimated as 0.70ct.  Colour estimated as I.  Clarity estimated as SI1.  The cluster measures 13.35mm in diameter.  Mounted in 18ct yellow gold with textured shoulders and platinum claw settings.  Finger size M.  Stamped inside shank 18CT PLAT.  Gross weight 5.7g.  There is a small chip on the zircon under one of the claws.