This is a unique, small, hand painted, Czech glass button featuring a beautiful matte aqua moon face. It has a soft gold iridescence.
Czech glass buttons are still made by hand by skilled artisans in the Czech Republic, many with vintage molds. They are hand painted and many are detailed with 24 karat gold or platinum. They have a metal shank.
This button includes a silver plated brass pendant converter. It has two loops on the back for even hanging. You'll need to file the center hole larger, or snip off the shank loop and then just glue the converter to the button back.
If you leave the shank on, buttons can be used in wire wrapped rings, bracelets, bead weaving, as a toggle clasp with a loop of seed beads, a purse clasp, or as a button on clothing (hand wash garments).