Onyx is a variety of quartz, a variant of chalcedony and related to agate. That sounds a bit complicated, but it comes down to the fact that Onyx always consists of 2 colours in mostly parallel layers. One layer is always white or black and the other layer can take on almost any color. We then speak of a two-coloured quartz variant. Agate is a four-colour quartz variant.
Onyx has a long history as an ornamental stone. Since the beginning of the era onyx has been used by the Romans in rings and amulets. The Old Testament also mentions 'shoham' stones that stand for onyx. Onyx is also nowdays still a popular ornamental stone.
Working of onyx.
Blue onyx increases the happiness of life and strengthens your determination to change bad habits. The stone can help to reduce stress complaints and regain control. It provides balance so that challenges can be overcome.