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Agate is a banded form of chalcedony. The banding indicates the presence of trace elements at the time the crystals formed.
Chalcedony is composed of alternating crystals of quartz and moganite (a polymorph of quartz). Quartz and moganite have differently shaped crystals, and in the case of chalcedony, the crystals are so small they can even be difficult to discern under low magnification.
The agate in this sterling silver ring is slightly red. Size 9.