To make and use it easy as a pendant, this design has a tube hole to thread on back of a pendant. If you use 0.8-1mm a bit harder, flexible strings like vinyl cords for it, you don't need to use even needle to thread it. Just use hands, and make a knot at each edge of pendant after that. Of course, if you want to use metal chains, you could link at end of pendant with a jumpring for chains and findings.
A recommended material is frosted ultra detail, or metalic plastic. Especially, a half-transparent looks would be suitable for this design.
In a case, you might want to use coating spray for UV cut to prevent looks turning yellowish color by sunlight in this transparent, frosted detail plastic.
Metalic texture would be also good for this design, too.