Oh I see! Well then, why don't you make one out of a wood disk? Just saw a thick branch to make a coin, sand it down and paint a pentacle on it (use a ruler and permanent markers if your not artistic. Put a (small) nail about 1/2 inch from the top and hammer a hole through, pull out the nail. Viola! Instant pentacle and one of a kind. =)
Another choice is to make something like a dreamcatcher. Get a thin (green) branch--young and flexible. Bend it into a circle and let it dry out. Wrap the whole thing in ribbon, cord or strips of thin fabric. Then take embroidery floss, cord, string etc and knot it at the top. Mark all 5 points of a pentagon on the circle. Then as you would draw a pentacle, pull the string to the bottom right (knot it), then top left (knot it), then top right (knot it), then bottom left (knot it) and the pull it back up to the top and make the final knot. You can incorporate knot magick into it while you do it, binding into it a protection spell. If you leave enough string in the beginning, you can tie the two ends together and have yourself an instant "chain". Just trim off any additional length.