To make the silver one, I used:
- a length of flexible irrigation tubing
- 20 x 20mm nuts
- 12 x 30mm nuts
- 3 x 45mm nuts
- plumbing pipe fastener (to hold the necklace together at the back)
And the gold one:
- 5 meters cheap gold chain from a craft store
- 2 x "some random piece of plumbing pipe thing"
- 1 x "some slightly larger piece of plumbing pipe thing"
- excuse the vague there, I don't know the right name for those things..