Attaching your jewelry to chains can be accomplished in many ways. Two popular ways are the floating jumpring, which allows the pendant to slide freely on the chain, and festooned, where the chain attaches to each edge of the pendant.
Advantage of the floating jumpring is it is quick and easy, disadvantage is the clasp has a habit of winding up right next to the charm. One solution is to link thru the chain at the attachment point but this is not always possible due to the chain style you may be using.
An alternate solution is to attach a festooned chain. This is a chain that has been cut midway which insures the clasp will stay in its position relative to the pendant.
Garlan can provide chains pre assembled either way. Contact Bruce@ogil.com for more information