Purest blue tourmalines are truly special because of their beauty and rarity. They are highly esteemed by collectors. They are at their most valuable when they show an intense, clear, radiant blue which is not too dark, the kind of blue that puts one in mind of a vivid aquamarine or a bright sapphire. The pure blue of the tourmaline fires harmony. Perhaps it is for that reason that the gemstone therapists claim that a blue tourmaline makes people both honorable and tolerant.

These rare blue gemstones originate mostly in the classical country of tourmalines, Brazil, or, to put it more exactly, in the north of Brazil, where the magnificent turquoise Paraiba tourmalines were also discovered. However, they are also found today in the gemstone mines of Namibia, Afghanistan and Pakistan and, since recently, also in those of Nigeria.

Sometimes, the gemstone specialists refer to the blue tourmaline as an 'indigolith' ('blue stone'), but the term blue tourmaline is generally used. Color is the most valuable feature of this gem, because inclusions are not common in this variety, they should be free of them. Large blue tourmalines of over 20 carats are also common and prices per carats do not always raise with larger stones, contrarily to rubies or sapphires.