With this pattern you can use any wire type and wire size you have, as well as any tool you have. wire size to make pendant with stone 45x25mm (can + a few centimeters to depreciate) 24 gauge ...
Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : 2 x 15cm ( 6 inch) 28 gauge ( wire diameter 0.3mm ) : 20cm ( 8 inch) ...