An enamel and diamond memorial pendant, circa 1792The lozenge-shaped blue and white guilloché enamel plaque centrally set with a cushion-shaped diamond in a pinched collet closed-back setting, the reverse inscribed Maria Heathcou 15 Jan 1792, a compartment to the reverse, to a fancy link chain of blue guilloché enamel batons, mounted in yellow gold, principal diamond very approx. 2.60cts, some enamel losses, glazing deficient from compartment, lengths: pendant 2.9cm, chain 42.4cm