Soft copper wire : 20 gauge (wire diameter 0.8mm) : 4cm (about 1.5 inch) for each link 4.5cm (about 1.8 inch) for clasp ...

Have you tried this bead combination, it's also very interesting. You can use any wire size, any beads (have hole) you have. Large diameter wire will be more difficult to manipulate, but will increase ...