A diamond Maltese cross brooch/pendant

A diamond Maltese cross brooch/pendant, the arms of the cross with fleur-de-lys motifs between, set throughout with cushion-shaped and pear-shaped diamonds, with a cushion-shaped diamond cluster to the centre, mounted in silver and gold, detachable pendant loop, diamonds approximately 11.50 carats total, in fitted case by Collingwood & Son, 48 Conduit St London, gross weight 17.7 grams, circa 1820.

No. 25984M