You are buying a 1 3/8” wide 10k YELLOW GOLD CIRCLE PIN WITH 2 applied pin top. Mu Phi Epsilon was a coed professional musicians fraternity The pin on the right is black enamelled with seed pearls. The circle pin is marked 10k on the back top of safety clasp. There is also a 10k mark on the back of the triangular pin. This pin weighs 5.6 grams.