Ruby, the birthstone for July, is most often found in a vibrant and rich red that is the true envy of any other gemstone on Earth. Ruby is a wonderfully fluorescent stone that allows it to glow in sunlight, and is found in a variety of hues ranging from vivid red to pale pink. It is one of the most precious stones in the world, and at 9 on the Mohs scale of hardness makes it durable enough to last a lifetime.