Assignment of zodiac signs: Aries, Sagittarius, Aquarius
Onyx is a two-tone layered, fibrous variety of chalcedony, which in turn is a variety of the mineral quartz. Agate is a similar but multi-colored variety.
Do not forget that every stone also needs care. This can vary from stone to stone. As a rule of thumb, however, you should clean your stone under running water after each use, especially if different people are being massaged with the same stone!
The gemstone ball has a diameter of approx. 3.0 cm and fits into all Joya massage products.