Three 1970s dress rings, the first of ropetwist and round-cut ruby set whorl design, mounted in yellow precious metal, stamped ‘750’; the second collet set with an oval mixed-cut smoky quartz, the mount with applied ropetwist detail, stamped ‘750’; the third of abstract textured bombé cluster design, accented with round-cut emeralds and single-cut diamonds, shank stamped ‘750’. £500-£700