Tourmaline is a gemstone that can be found in a variety of colors, including pink, red, green, blue, and yellow. It is a popular gemstone for both jewelry and collectors. There are a few ways to tell if a tourmaline is real. First, look at the color. Real tourmaline should be a deep, rich color. If the color is pale or washed out, it is probably not real. Second, look at the clarity. Real tourmaline should be clear, without any inclusions or flaws. If the stone is cloudy or has any imperfections, it is probably not real. Third, look at the cut. Real tourmaline should be cut in a way that maximizes its color and brilliance. If the cut is poor, or the stone is dull, it is probably not real. If you are still unsure if a tourmaline is real, you can always take it to a gemologist or jeweler for an expert opinion.