A natural pearl, seed pearl and diamond necklace, early 20th century, the necklace composed of three

A natural pearl, seed pearl and diamond necklace, early 20th century, the necklace composed of three strands of seed pearls, centring on a pansy motif set with cushion-shaped diamonds, suspending a detachable pendant set with a natural pearl measuring approximately 12.3 x 11.0mm, within a border of circular-cut diamonds, mounted in silver and gold, necklace length 43cm, detachable section of pendant length 3.5cm, pearls in necklace and clasp untested, fitted case stamped Collingwood & Co

A verbal report from GCS states that the pearl in the pendant is natural, saltwater.