Bottom disc's diameter is 10mm (the disc can't be removed from the pin).
Pin is 14g-1.6 mm thick and 9.5 mm long.
Mother of Pearl meaning- "The luminescence of Mother of Pearl has made it a most popular choice for jewelry for centuries. This iridescent substance is not a gem stone but rather is formed in the lining of the shells fresh-water or salt-water mollusks.
Mother of pearl has a special symbolism in China, where it is highly prized as a stone that attracts fortune and happiness to anyone who owns it. It is considered a good luck amulet as well, and is often given to loved ones to wish them good luck and prosperity in life."