Crimp individual strands onto either a 3-strand spacer bar or directly to the lengths of chain. Then connect one end of the chain to the spacer bars (if you choose to use those in your design) and then the other end to the clasp using jumprings or a length of wire finished with a wrapped loop on each end.
The chain you choose could complement the shape of the turquoise beads. If using larger turquoise nuggets use a heavier, larger link chain; if using chips, small round beads or small nuggets, select a finer gauge chain with smaller links.
Other colors and textures may be integrated also. Natural materials, such as coral, bone, horn or wood may bring additional interest to your necklace. Some of these materials are lightweight so they won't add to the heaviness you are concerned about.
There are many multi-strand design projects in our Beading Instructions section, look through the selection of links listed below to see if any designs strike your fancy. And if you need instructions on opening and closing a jumpring or finishing wire with a wrapped loop, there are instructions for these techniques too.