This item is a metal button with a unique weathered iron look. The ornate detail on the surface of the domed button closely resembles it to a flower bud.
It has a loop shank back.
They are sold in lots of 3, 5 and 8 in the size of your choice.
The sizes are as follows: 7/8 inches = 22mm, 3/4 inches = 19mm & 11/16 inches = 17mm.