So, here's a picture of a glass full of gemstones.

The object, obviously, is to guess how many gemstones are in it. (I may even give a small prize from my inventory to the three people who can tell me the most names of the stones that are visible (and, yes, I know what all of them are).
Rules
1. A number can only be guessed once.
2. Only one guess per person. (Rule 1 is the only exception).
3. I won't give any hints
4. Good luck and have fun!
(Are you celebrating Samhain instead of Beltane? Then hop over to this thread)!