Pink and clear glass, 'piecrust' edge, translucent glass from Europe around the 1920's. New Old Stock, they've been in storage all that time; never circulated or used.  1/2" diameter or slightly larger, domed and plump.  Self shank. Beautiful pristine condition. Sold by the button. If you order 6 they will probably be sewn on to a newly printed, vintage-reproduction card.