Three reasons why you may have too many duffle coat buttons and be looking for something to do with them:
1 - That failed alchemical experiment in which you discovered the way to transmute base metal into duffle coat buttons
2 - Have been left large amount of duffle coat buttons in a will
3 - You own a duffle coat button factory
Whatever the reason, here's a way to make some duffle coat button jewellery from a 1950s Girl Annual. I think Luna Lovegood would like these a lot.
To make a choker you will need 8 or 9 wooden duffle coat buttons, twice as many 3/8 inch brass screw eyes and a No 001 bead clasp. Rub the buttons down with fine sandpaper. Pierce the end of the button and screw in two eyes. Colour with a coat of poster paint, and then varnish or enamel. Tie the screw eyes together neatly but firmly with matching thread and fasten on clasp.
Variations: 1 - Have all beads identical in colouring. 2 - Shade from light to dark and back again in one colour. 3 - Keep to two alternating colours. 4 - Paint each one a different colour. 5 - Stipple with gold or silver paint afterwards.
For ear-rings, cut one button in two and tie the screw eyes with cotton on to the tiny rings of screw-on ear-rings.