Pretty, puffy cloud is a nice description. And, perhaps, a good design starting point.
This one was an auction. I bid a little over $15 since that was the general closing bids on similar pearls. It was from Augustus Collection. The photo was pretty accurate, although it didn't show the pinkish overtones well. I guess I just don't trust eBay descriptions much - "unheated sapphire", "untreated ruby", etc. I was probably hasty in my comment and I should have left it out, since I am no expert and it is a serious accusation.