The fascinating Garnet is the representative Capricorn birthstone for those born under the January Garnet presents a precious stone that reflects reliability and awareness. The zodiac birthstone could be used in accessories and jewelry items. This birthstone is thought to bring awareness and truthfulness to all Capricorns and also to help them when they commit to a certain cause. This stone is derived from the name meaning seeds: granatum. This gemstone comes in red, black and green shades. Another birthstone considered beneficial for Capricorn natives is Sapphire.