1 Drill or melt a hole straight through the side of each 1×1 brick. If you are using a ready-made necklace, remove the clasp/jump ring from one end, and check the size of the remaining crimp/chain, to ensure the hole will be big enough.
2 Thread each brick onto the necklace, alternating between grey and black. Check all the bricks are the same way up.
5 Re-attach the jump ring/clasp to the end of the necklace.