Full tutorial video link above the title wire size to make big ring diameter 1,5-2cm (can + a few centimeters to depreciate) ...

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 Spherical crystal 6mm diameter Can use 4 or 6mm beads, or any beads you have ...