Pure, saturated yellow tourmaline is very rarre and sometimes referred to as “canary” tourmalines. More common hues are pale yellow and greenish yellow. Scientifically, tourmalines are an interesting mineral, due to their wide colour range. It is a boron silicate containing elements such as aluminium, iron, magnesium, sodium, lithium or potassium that give tourmaline its varied hues. Many crystals exhibit two or more colours and specimens displaying only one colour are rare. Tourmalines are mined in every continent.