Two late 18th century diamond-set rings1st: The oval blue guilloché enamel plaque with applied old brilliant, single and rose-cut diamond floral and foliate decoration, closed back settings throughout, with engraved bright-cut decoration to the surround and shoulders, mounted in gold, 2nd: The oval blue glass plaque with applied rose-cut diamond star motifs within a seed-pearl surround, between foliate shoulders, closed back settings throughout, mounted in gold, 1st: later band, 2nd with damage and later repairs to foliate shoulders, ring sizes: 1st approx. K, 2nd approx. N (2)