The term ‘Tourmaline’ is the name given to a large group of boron silicate minerals. Tourmaline has a hardness rating of 7-7.5. This gemstone can be found in a wide variety of colours such as green, pink, blue, yellow, red, orange and colour-zoned/bi-coloured...
Tourmaline is a boron silicate mineral which comes in a variety of colours due to the trace elements found within, and is the birthstone for October. The most common colour of tourmaline is green, followed by pink, yellow, blue, black and brown. Tourmaline is also...