Faux Onyx with CRYSTAL edge Button Cover in SILVER or Gold platted setting (pictured in gold). Can be worn with banded collar mandarin collar shirt or top button of any shirt.Button covers are generally used with shirts that have a wing tip color or a mandarin color. The button cover will be placed on the very top button of your shirt. Along with the button cover, it is customary to use studs as buttons for the rest of your shirt. The reason for button covers is because of the absence of a tie. If there was a tie used the top button would be covered, but with no tie, a button cover is used to cover the very top button of your shirt.