Thanks for your reply guys, im not too sure myself yet but been using them regardless.
I still think the purpler one might be amethyst. It does look more purple in the flesh maybe its just the picture, it is about half an inch in size and has a bit of white in it but is mainly purple and bits of it are more see threw specially in the light, in the dark yes it does go dull and looks shadowy.
Thanks,
Eyeopen.