is agate onyx always dyed
Black and colored onyx is always dyed. Onyz is easily dyed, so beware of the more unnatural looking colors, such as bright blue, etc. Onyx with red and white bands is sometimes referred to as Sardonyx.Onyx is the black variety of agate.However some parts are more or less translucent.nyz is easily dyed, so beware of the more unnatural looking colors, such as bright blue, etc. Onyx with red and white bands is sometimes referred to as Sardonyx. Onyx is the black variety of agate. However some parts are more or less translucent.