Early 19th century French rose cut diamond necklace, with removable chain, & provision for brooch/pendant attachment. Approx. 172 diamonds in silver setting, total diamonds appro x 2ct. (W56.45g). Provenance: Count Louis de Castelvecchio (1826-1869), Son of King Louis Bonaparte of Holland (Napoleon's brother); thence by direct descent to current owner - private collection, ACT (Canberra).