Tourmaline is part of the list of minerals in the silicate family.
The variation in the gem's chemical compositions offers an incredible variety of colors, including bicolor stones like the pink and green watermelon tourmaline.
The tourmaline family consists of about fourteen species. The most famous is the elbaite, which comes in colors ranging from pink to blue, or colorless and green.
Elbaite is much more coveted than other opaque or black tourmaline stones.
The most popular color of the October birthstone remains yellow-green.
Tourmaline includes several chemical elements: iron, aluminum, copper, magnesium, manganese.
The latter allows the gems to retain their pink colors, sometimes turning red and often associated with white.
The October birthstone is scattered in different regions of the world: Brazil, Tanzania, Namibia, Mozambique, Sri Lanka, Madagascar, Afghanistan, India, Italy, Australia...
But the most beautiful in red and green color is found in California, United States.