Bonhams 1793 : A diamond single-stone ring, by Cartier

The rectangular step-cut diamond with cut corners, set horizontally within a rub-over mount, to a heavy gold bevelled hoop with baguette-cut diamond gallery, principal diamond approximately 3.60 carats, signed Cartier and numbered, maker's mark, French assay marks and European convention marks, ring size N½, fitted maker's case

Sold for £22,200 inc. premium