What does co35 10k mex mean on hoop earrings?

The marking "CO35 10K MEX" on hoop earrings typically indicates the composition and origin of the jewelry. "10K" signifies that the earrings are made of 10 karat gold, which contains 41.7% gold content. "MEX" suggests that the earrings were made in Mexico. The "CO35" may refer to a specific manufacturer or design code.