I’ve been considering using some Pearl Nautilus shells as sculpting material. However, after doing some essential research I changed my mind. It’s being overfished and it will become endangered species in the near future.
(source: http://www.nytimes.com/2011/10/25/science/25nautilus.html?pagewanted=all&_r=0)
This is what one looks like on the left. In case you see it on your exotic holidays or online, think twice about getting it. I’m going for a more sustainable alternative, farmed Abalone on the right.