Red Gemstones: List of Red Precious & Semi ... - GemSelect
Oct 11, 2017 · Red agate is a rare find with unicolor, but banded red agate is quite common. Most red agates will exhibit other colors in their patterns, such as gray, blue, black and white. Solid, single-color red agate gemstones are often dyed to imitate carnelian, another closely-related gemstone. Agate is a layered or banded variety of chalcedony quartz.