A typically approved requirement in the interpretation of Agate is that it has to be banded. This certification distinguishes it from other forms of Chalcedony which are not grouped. Exemptions include Dendritic Agate and Moss Agate, which are not real Agates given that they lack the banding patterns, but they are still generally called Agates given that they have greater than one shade. Onyx, when grouped white and black, is technically a type of Agate, and also Sardonyx, which is a grouped reddish and white Chalcedony, is additionally technically a kind of Agate. Some kinds of Carnelian might likewise show banding and also can consequently be classified as both Carnelian and Agate.

A fine and sharp grouped pattern, integrated with natural solid colouring, will promptly increase the expense as well as worth of as well as Agate. Other variety names made use of will certainly connote particular shades or patterns, such as Fire Agate or Eye Agate.

Agates, as well as Jasper, were traditionally found in the Idar-Oberstein area, and also cut and polished by a local artisan. With the exploration of the substantial Agate down payments in the Rio Grande do Sul, Brazil in the 1800s, the new product was delivered to Idar-Oberstein for brightening as well as reducing.