It is actually the Sacred Lozenge. As long as you wear it, you will never need another cough drop. You won it by defeating the Tepid Witch of the Middle.

The stone is actually a bubble universe on your finger, if you look within you can see entire civilizations rise and fall and rise again. Time is different there, and gravity, and light and sound and that other sense they have that is beyond our perception, but so far beyond we don't have words for it in any human language yet. They can't see us, but they evolved generation after generation with more fabulous and diverse millinery. Hatters were the leaders in government, and it was the roman empire lead cups scenario all over again because of that chemical, it's not the same there but you know what I mean, it drives you MAD. The hatters had to be stopped, so the universe was contained and hidden in a time capsule, waiting for the right guardian to protect it and heal it and prevent the Hatters from developing travel from their universe to others. That guardian is you.