The Tiffany Elsa Peretti Bean Thread

This has to be one of my favorite pieces from Tiffany's; my SO bought me a larger one off of Bonanza a couple of years ago, and this past summer I bought myself another one, in the smaller size.
I noticed something interesting about my bean.
The bean that my SO bought for me off of Bonanza is an older bean. I had it authenticated, I know its real, but the other day when we were in Tiffany's I saw a larger bean (I don't know if I have the 18mm or the 20mm), and it looked more like an actual bean. I feel that the older bean I have looks more like an abstract bean, if that makes any sense.
I will post a quick pic here for now, but i will post more later; for example, how different the stamping is on the back and such.
I think it would be fun if we were to post our beans on here!
So please, post away with whatever information about the bean that you would like to share.
If anyone knows the history of the bean, I would love to hear about it.