Gaharu is a type of wood with various shapes and distinctive colors, and has a content of mastic levels, derived from trees or parts of gaharu-producing trees that grow naturally and have died, as a result of the infection process that occurs either naturally or artificially in the tree , and generally occurs in the Aquilaria sp. (Karas, Alim, Garu, Kigaru, Ki Gaharu, and others).
Gaharu trees are the most expensive trees in the world. In fact, gaharu tree prices can exceed the price of teak or Ulin (Iron Wood) though, the more fragrant the quality of gaharu and the higher the selling price.