Cut the 4" piece in half so you have two 2" pieces.
Use a jump ring to add the pear crystal to the bottom of one 2" chain. Place 1 crystal (different colors) on about 9 head pins. Wire wrap the 9 head pins onto different loops in the chain, concentrating more towards the bottom, and less as you go up the chain. New to jewelry-making? See Jewelry Basics 101 (PDF).
Take a jump ring and place the chain dangle and the marquise together.
Take the other 2" chain and run it through the jump ring at the top of the marquise. At each end of this chain, make a small wire-wrapped loop using scrap wire from your head pins, add a crystal bead, and wire-wrap the other end back onto the necklace.
1 each #44-050-76-93 12kt Gold-Filled Jewelry Link, Hammered Marquise, 38.5mm
1 10-pack #37-672 14kt Gold-Filled Ball End Head Pin, 2"