The largest butterfly is 2″ x 2″ and is marked sterling, butterfly with turquoise is also marked for sterling and artist Mexico mark, the smallest has gold tone over silver is likely European or Oriental in origin and no mark that I could find, total weight of all three is 26.9 grams, all 3 included.  The enamel one is likely circa 1920′s/30′s, the other two are also lovely vintage pins.