Connect the pendant to a chain with a clasp and extension chain, choose the colors of crystals you like, and use the prong pusher tool to embed them into the stone settings, and you're done!
These are decorated metal elements with one stone setting at the center that are embedded with just one SW crystal:
These are metal casting pendants all made for the 12X12 square Swarovski crystal:
These are combed stone settings soldered together to make a pendant with several SW crystals:
Have fun creating!