Use a jump ring to connect sets of 5 wrapped loop crystal dangles to the chain.
Space the sets about 0.5" apart along the chain in desired locations.
Attach a leaf to one end of the chain. Run the other end of the chain through this leaf before attaching the other leaf.
By attaching sets of dangles above and below the chain when it passes through the upper leaf, you can "lock in" the length of the necklace when you wear this lariat-style necklace (see alternate image below).
1 gross [use approximately 45] #05-328-04-907 Crystal Jams™ Assortment, Faceted Bicone, 4mm - Limited Availability ... Individual colors used are shown in the linked parts, in case this assortment is no longer available.
1 pkg of 6 [use 2] #44-180-004-3 Filigree, Leaf, 65x37mm
1 bag of 100 [use 45] #37-091-15-3 Head Pin, 1.5", Thin, Ball End