A natural pearl stick pin, France, late 19th/early 20th century, capped with a natural pearl of grey

A natural pearl stick pin, France, late 19th/early 20th century, capped with a natural pearl of grey tint measuring approximately 7.7 x 7.0 x 7.0mm and rose-cut diamonds, mounted in gold, length 7.1cm, indistinct French maker's mark, fitted case stamped R.Laurin Bâle

Accompanied by LFG Paris report no. 401090, dated 25th April 2023, stating that the pearl measuring 7.0-7.1x7.8mm diameter is natural, saltwater