Onyx is a banded variety of chalcedony, similar to agate. The color bands in onyx can be any color. The greenish-brown colors in Mexican Onyx are very specific to this variety. It is used often for carving. Mexican Onyx is considered to be a stone of confidence and awakens inner strength. It also encourages positive thinking and brings guidance.
These dice can be used for games, and some people have told us that you can freeze them and use them as ice cube replacements.