Simple! Fabric yo-yos made out of what looks like light gray chiffon (how to make a fabric yo-yo tutorial here: http://zakkalife.blogspot.com/2009/06/how-to-sew-fabric-yo-yos.html) hand-stitched to one another (you can even see the tiny stitches anchoring them all together in the photo).

Crystal glued in the center of each yo-yo; tiny pearls glued or sewn in a ring around each crystal. I’d recommend using a wide satin ribbon that you can tie around your neck as a closure for the back of the necklace, attaching each side to the sides of your yo-yo cluster.

Hope that helps and have fun making it!
xoxox
Carly