1940s Diamond Set Tank Ring in 18kt Yellow Gold

1940s diamond set tank ring in 18kt yellow gold. Centred with an estimated 0.70ct cushion shape Old Mine cut diamond in a platinum square collet decorated to the broad shoulders with six vertically set cushion shape Old Mine cut diamonds in platinum square collets, to a chunky, three-dimensional plaque, with curved raised terminals, polished gallery and integrated broad shoulders which smooth and taper to a solid shank.