There is something fabulously and definitively fifties about this ring by Berca. The high dome is set with diamonds, on a blue enamel ground. It’s like gazing up at the stars at night.

This is on sale for 20% off at the time of writing, for USD$3,630.48 from 1st Dibs. The site now regrettably hides the names of the actual sellers; this one is based in Italy.