Some gemstones are counted as a birthstone in astrology. Specific zodiac signs are connected with particular gemstones and give their maximum astronomical benefits to the person. Here are some particular birthstones for the months. January birthstone is garnet. Amethyst is the birthstone of February. For March aquamarine is the birthstone. April birthstone is known as diamond. Emerald is considered a May birthstone. For June individual's birthstone is alexandrite. Ruby is known as the birthstone of July. August birthstone is Peridot. Sapphire is counted as a birthstone in September. October Birthstone is tourmaline. Topaz is known as the birthstone of November and December. If a gemstone is worn with consultation of an expert astrologer in this condition it is given its maximum benefits to the wearer and helps to reduce the problem in its life.