I was happy to find these HUGE Rainbow Obsidian beads to make pendulums! They are AAA R.O., which means that almost all of the 18mm beads has a rainbow on it. It has a 10mm bob handle that is also AAA R.O., and a sturdy Silver chain. About 5 1/2 inches long.
I always ritually craft my pendulums on a Monday or Wednesday when the Moon is Half Full, and this one is also from a batch that I made on the Autumnal Equinox, Sept 23, 2020, for even more balance.