Vintage B Initial Genuine Diamond Tie tac in 14 Karat Yellow Gold

B block initial is encrusted with genuine diamonds. I estimate total carat weight at around 1/2 carat. Diamonds are G-H color, SI clarity. Weight is .60 gram. It measures 10.90mm (0.43”) x 8mm (0.32”). The initial and post are 14K yellow gold, while the clutch mechanism is gold filled.