Onyx (Dyed) Silver Earrings

Earrings made of 925 sterling silver and onyx (colored).

onyx
Onyx is the black variant of chalcedony/agate, an agate with black and white bands is usually called onyx and pure black chalcedony without bands is also called onyx.
However, since there are too few known natural deposits of genuine onyx and these cannot meet the demand for onyx for jewelry making, the majority of onyx on the market is colored.
The dyeing of agate and chalcedony was already a widespread practice in Roman times, and dyed onyx was also produced at that time.
It is practically impossible to distinguish between real and dyed onyx and can only be done through laboratory testing. Only if an onyx has white bands is it relatively likely that it is real.