Weighs approx 1 gram and measures 5.7cms high. The rear of the pin is stamped 10K, I’m of the opinion that its a synthetic red stone not natural.
Stamped on the pin stem at the top but can’t decipher, acid tested as minimun 10k gold. Weighs approx 1.8grams & is 6cms high. The face of the stone exhibits very minor wear.