Among all the different types of Tourmaline that you will find in the market, one pattern that repeats itself is that every tourmaline variety has a highly similar crystal structure but it widely differs in its chemical composition. What is a tourmaline? In simple words, tourmaline is nothing but a group of silicate minerals. This special gemstone is known to have the broadest color ranges among all the different families of gemstones. color range. As a semi-precious gemstone, tourmaline comes in a variety of colors – it doesn’t matter what your personality is, you will find one or the other color within the tourmaline family that suits you.