Early 19th century diamond cluster necklace, circa 1820
Early 19th century diamond cluster necklace, c.1820, the principal central diamond of approximately 4.75ct, the articulated collar composed of alternating circular clusters and openwork navette-shaped links, collet-set throughout with old-cut diamonds, graduating in size from the centre, mounted in silver and gold, part close set, the central diamonds open set, the central section detaches to form a bracelet.