Essentially the most ancient in the August birthstones, sardonyx is a mix of two types of chalcedony (cryptocrystalline quartz): sard and onyx. Bands of brownish purple to brown to darkish orange sard alternate with commonly white or black layers of onyx. Sellers seeking to mature their enterprise and reach far https://www.gemsbiz.com/blog/explore/birthstones-by-zodiac-sign