Steps: 1. Cut three pieces of brass wire for the bottom of the pyramid pendant.
2. Sand all the edges at a 45-degree angle on a belt sander. The wire will heat up, so be careful of your fingers (figure A).
3. Fit the pieces together into a triangle shape and solder, applying flux to the ends and firing with a butane torch (figure B).
4. Cut three more pieces of brass wire for the vertical posts of the pyramid.
5. Sand all the edges at a 60-degree angle on a belt sander.
6. Solder two vertical posts at a 60-degree angle, applying flux to the ends and firing with a butane torch (figure C). Hold the brass wire with tweezers to prevent burning your fingers.
7. Place the marble in the bottom part of the pyramid (figure D).
8. Solder the remaining vertical post after applying flux to the joint (figure E).
9. Sand the top flat.
10. Cut and bend a loop from the brass wire for the cord. Flatten the brass by hammering the end. Bend it around needle nose pliers.
11. Solder the loop on the top of the pyramid (figure F).
12. Thread the cord for the necklace through the loop. Tie the copper pyramid pendant around your neck.
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