Just finished this pearl necklace last night. I had picked these pearls up a couple of years ago, as well as the clasp. It only occurred to me last night they would work together.
I think the clasp really makes the whole thing work. I got it from The Fire Goddess, at a bead show.
The above link is to The Fire Goddess website. She has awesome beads, charms, and toggles. Her toggles are some of my favorite things. I was going to sell this piece, but I love it soooo much I might keep it for myself.
Here's a close up of the toggle.