18K Sea Urchin Diamond Brooch, France

18K yellow gold sea urchin brooch made in France with a prong set round diamond .15 carat, SI1 clarity, E color. The brooch is marked along the rim with "A star D" and "France". The brooch has a trombone clasp and measures 1 3/8" in diameter and stands 9/16" high not including the clasp. 11.1dwt.
Condition Report: A few of the sea urchin spikes are bent near the tip. Overall very good condition.