Custom 18K white gold 0.12ct Diamond Oval Jadeite Cabochon ring

This unique design solid 18K white gold ring from circa 1950-1960. Custom made, it features open work design of the ring crown like a Tiare, six prongs holding one oval cut natural Jadeite cabochon, it measures 15.77 x 12.0 x 5.2mm, it bezel set one round brilliant diamond on the top of each prong, approx. 1.75mm, combine approx. 0.12ct. Ring thop is 18. x 17.0mm, 13.0mm rises from finger. Ring size 7.5, weight 6.4gm, hallmark 18K