An early 19th century gold, enamel, turquoise and diamond parure

An early 19th century gold, enamel, turquoise and diamond parure
Comprising: a necklace composed of graduated, black enamel cartouche panels each set with a pear-shaped cabochon turquoise and rose-cut diamond cluster within a gold reeded border, with matching earpendants, brooch, hair comb, and various pendant fittings, circa 1810, fitted case.