 Top quality "kyara" costs over 40,000 yen per gram, or many times the equivalent weight of gold (as of late 2012).If the particular piece of incense wood has a history, the price can be even higher.The highest regarded wood, ranjyatai, dates back to at least the 10th century and is "kyara" wood from Laos or Vietnam, and was used by emperors and warlords for its fragrance.