Square cabochon 1.8cm (cat eye stone) Soft copper wire 26 gauge ( wire diameter 0.4mm ) : 50cm( 20 inch) Use tape to fix the rope and stone for easy manipulation You can use wire with diameter from 0.

Wire size to make pendant with agate stone 30x16mm (can + a few centimeters to depreciate) - 20 gauge (wire diameter 0.8mm): 30cm (12 inch) - 22 gauge (wire diameter 0.6mm): 25cm (10 inch) - 28 gauge ...