Coming in a rainbow of colors, Tourmaline is an alternative birthstone for the month of October. Tourmaline can be found in shades of pink, green, red, orange, blue, and green - sometimes with multiple colors within the same crystal! One variety, known as "watermelon tourmaline" exhibits green coloration on the outside, and vibrant pink on the inside. Jewelers will often cut these stones into slices to show off their unique coloration.

Tourmaline was discovered in the Americas, but the word comes from the Sinhalese word toramalli, which can refer to a variety of gemstones. For centuries, it was mistaken for other gemstones, because of its wide range of colors. Major deposits of Tourmaline have been found in California, Maine, and Brazil, but also in other parts of the world.

The mineral makeup of Tourmaline is a combination of silicon, aluminum, and boron; the color of the stone is determined by the presence of various other minerals. They come in a variety of sizes, allowing for tourmalines to be cut into any shape, but the crystaline structure lends itself to a long thing rectangular cut.