North Carolina has more than 63 different types of naturally occurring gems and minerals can be found here. In addition to emeralds North Carolina gem mine contains aquamarine, sapphire, garnet, topaz, amethyst, citrine, rutile, and tourmaline, as well as an abundance of world class smoky and clear quartz crystals. Emeralds for sale, colored gemstones, grading of emerald, fine emeralds, emerald transparency, top emeralds, top gems, quality emeralds, emeralds transparency.