Amethyst
Inner peace
He can clarify all superfluous thoughts and feelings and thereby promote inner peace and concentration.

The importance of gemstone water has been known for hundreds of years.
In her remarks Hildegard von Bingen already mentioned the use of gemstone water.
Information from the stone is transferred to the water during the production of gemstone water. So it's not about taking something away from the stones - it's the energy or information of the stone which is transferred to the water. The effect of the gemstone is thus transferred to the newly created water.