1970s citrine and diamond cubist ring in 18kt yellow gold

1970s citrine and diamond cubist ring in 18kt yellow gold. Centrally set with a square step cut citrine in a four claw setting, flanked by to rectangular baguette cut diamonds in raised tension settings, to a three-dimensional cubist design featuring squared polished settings, columnar forms throughout which continue to the shoulders and flow to a solid three ribbed shank. Tested 18kt gold.