The roll-on bottle allows oils to be applied precisely and easily to the skin. The ball is made of smoothly polished amethyst, and the stones placed inside create a unique visual effect. It is also believed that they enhance the effect of the mixture. Amethyst is thought to have healing properties that protect against negative energies. The stone is also known for bringing clarity and peacefulness to the mind. It is said to help control negative thoughts, initiate wisdom, and promote clear thinking. These gemstone roller bottles can be filled with essential oils, perfume oils, DIY blends, essences, aromatherapy mixtures, and other liquids.