Deco 10K purple Sapphire Split cultured Pearl Crescent moon Brooch 9.4g JR9935

Antique 9 karats Deep purple Sapphire & Split cultured Pearl Crescent  moon Pin Brooch 
It has fifty-two (52) graduated genuine cultured pearls in two rows punctuated with nine (9) graduated deep purple graduated size Sapphire, it shires in the light. Circa 1930-1940, 1.5" x 1.5", weight 9.4 grams, British hallmark, tested for 10K