A Celtic brooch, called also penannular brooch, made with a scrap piece of thick copper wire.
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(from wikipedia) Penannular: ("Annular" means formed as a ring and "penannular" formed as an incomplete ring) brooches feature a long pin attached by its head to a ring; the pin can move freely around the ring as far as the terminals. There is a gap between the terminals wide enough for the pin to pass through. Beginning as utilitarian fasteners in the Iron Age and Roman period, and in Ireland and Scotland from about 700 to 900, which are popularly known as Celtic brooches or similar terms. The brooches were worn by both men and women, usually singly at the shoulder by men and on the breast by women.
Step 1: WHAT YOU NEED
-a scrap piece of thick copper wire (I tried with 12, 10 and 8 gauge and they all worked well, in this tutorial I'm using the 10 gauge).
-hard still surface;
-round nose pliers;
-ring mandrel (or a tube of desired diameter).
Step 2: ANNEAL
Anneal the copper wire, it will make it more easy to work with.
Use pliers, as it became super hot!
Step 3: BEND
Bend the copper wire around your tube.
Step 4: CUT
Cut the piece almost to a full circumference, but not quite.
Step 5: HAMMER
Hammer the whole piece a bit,, and the edges more, so they will look like the ones in the photo.
Step 6: FILE
File the edges.
Step 7: CUT ANOTHER PIECE
Cut another piece of copper, longer than the diameter of the brooch.
Step 8: HAMMER AGAIN
Hammer the whole piece a bit.
Hammer flat an edge of about 1 cm (photo 1).
Hammer the other edge large (photo 2).
Step 9: CUT THE EDGE
Cut the edge you hammer large (not the 1 cm flat one, the other) like a point.
Step 10: FILE
File the two edges.
Step 11: WRAP
Wrap the 1 cm flat edge with the round nose pliers.
Insert it in the brooch.
Step 12: HOW IT WORK
So the wrap that you made around the brooch should be large enough to allowed the spike to move freely around it, but small enough to be stopped by the wide edges.
The spike should be longer than the brooch, so it will be stopped by it, ones the brooch is in place.
The space between the two large edges of the brooch should be wide enough to allow the spike to pass by.
Step 13: PLACE IT
Open the brooch wide and insert the spike in the shawl (or whatever you are using it on).
Close the brooch.
Turn it (all the way behind the spike), and close it.