A natural pearl and onyx bracelet, early 20th century, composed of graduated pearls measuring

A natural pearl and onyx bracelet, early 20th century, composed of graduated pearls measuring approximately 1.9-6.6mm diameter, and onyx beads, threaded on chain, suspending two similar pendants from its clasp, length 19cm, French assay mark for platinum, partial French maker's mark, possibly for Georges Lenfant

A verbal report from GCS states that the pearls are natural, saltwater