Agates are semi-precious gemstones that are a variegated form of chalcedony (pronounced kal-sed’-nee), which is silicon dioxide in the form of microscopic fibrous quartz crystals. With its combination of earthiness and elegance, agate is one of the most unusual gemstones. There are many varieties of agate, including Amethyst, Quartz, Black Agate, blue lace agate, moss […]