Single Tourmaline. An amazing Indicolite Tourmaline weighing 3.13cts from Tunduru, Tanzania. The stone is perfectly fashioned and the deep slightly greenish blue color is exceptional. Blue is one of the rarest and most valuable colors tourmaline can occur in and even stones like this at just over 3cts., are extremely rare and sought by collectors and connoisseurs. The word Indicolite is derived from the Latin word, meaning "indicum plant".