From belts to buttons, to pins to cuffs, these round or oval beauties are conchos. Or is is conchas? Wiki tells us that a concho is "A silver ornament, for use on clothing, either stamped with a design or inlaid with a stone." and a concha is "Any shell-shaped structure." In this case, they are both; both shaped like a shell and a silver ornament to be worn. A classic shape that adds beauty to be sure!