France, circa 1920.
The necklace is crafted in platinum and white 18K gold. It features a sparkling old mine cut diamond (7.2 x 7.1 x 3.96 mm, approximately 1.56 carats, I color, VS2 clarity) accented by four small old cut diamonds (H-I color, VS-SI clarity).
Estimated total diamond weight is 1.84 carats.
The drop-shape pendant measures 14 x 8 mm (1/2 x 5/16 in.)
Length of the chain is 46 cm (18 in.)
Marked on chain clasp with eagle and dog heads French assay marks for gold and platinum.