Attach the pinch bail to the top of the snowflake crystal. Align the bail prongs and the crystal hanging holes, then pinch together. Once attached, you can use nylon-jawed pliers to secure the bail by gently squeezing.
Add two 8mm jump rings to the bail. Use flat-nose pliers and chain-nose pliers to twist the jump rings open and then closed. See Jump Ring Hint in Jewelry Basics 101 (PDF).
Use two 4.5mm jump rings to connect the 8mm jump rings to the post earring loop.
Slide an earring back onto the earring post.
1 pair #32-130-10-AS TierraCast Opulence Post Earrings with Loop - Antiqued Silver Plated
2 each #06-704-20-425 Swarovski 6704 Snowflake Pendant, 20mm - Blue Shade
1 ten (use 2 pieces) #41-820-03-AS TierraCast Antiqued Silver Plated Pinch Bail (Prong Bail) Royal
1 ounce (use 8 jump rings) #37-100-1 White Plated Jump Ring, Round, Assorted Sizes -- use 4: 8mm (37-167-1) and 4: 4.5mm (37-133-1), available separately and also normally included in the assortment