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Worry stones are originally small, polished stones with a hollow designed to fit the thumb. They're used to promote relaxation. You rub your thumb on the stone, and the repetitive action brings a feeling of calm. You can thus soothe your anxieties by focusing all your attention on this gesture rather than on your thoughts or your surroundings.
I make my own worry stones, 100% handmade, with lots of love, in the form of little treats. Your "worry-free biscuit" can go everywhere with you (easily hidden in your pocket) and soothe you in any situation !