No oil Colombian emerald and diamond cluster ring, circa 1970.

No oil Colombian emerald and diamond cluster ring. Set to centre with an oval mixed cut natural Colombian emerald, with no oil, in an open back claw setting with a weight of 9.65 carats, further set with twenty four drop shape brilliant cut diamonds in open back claw settings with a combined approximate weight of 4.20 carats, and decorated with eight round brilliant cut diamonds in open back claw settings with a combined weight of 0.80 carats. The total approximate diamond weight is 5.00 carats, to an impressive cluster design featuring split curving claws, a pierced structural gallery and open backholing, leading to raised shoulders and flowing through to a solid flat shank. Tested white gold and yellow gold, maker's mark 'B J', circa 1970, accompanied by Swiss Gemmological Institute (SSEF) report #123840, and Gemmological Certification Services report #5782-2276.