Wire: You can use any kind of metal wire, though I prefer to use copper wire and aluminum wire, which are excellent for craft project, jewelry project, and more. If you are the beginners, I suggest copper wires which are inexpensive and look great for jewelry making.
Beads for jewelry making: Various beads can be added in wire wrapped jewelry, seed beads, glass beads, pearl beads, wooden beads, even gemstone. Choose the right beads to match the whole design.
Tools: There is no doubt that tools are important. I always use cheap jewelry pliers (~$10) for a while.
If you love these pendants too, go ahead to add your thoughts on DIY your own one. Nice crafting!