A rock crystal, white enamel and diamond memorial ring, circa 1755 Designed as a crowned heart, formed from a pear-shaped rock crystal, surmounted by three rose-cut diamonds, between openwork shoulders, to a scrolling hoop with white enamel accents, 'J. Town OB: 27 Jan 1755 AE 15' engraved to the outside band, ring size M From a private English collection.