What Nut Is the Most Expensive most expensive nut : Macadamia is the most expensive nutmeg in the world, selling for about US $ 45 per kg. Known as the Australian hazelnut, macadamia is native to Hawaii and Australia and is the world's most valuable fruit, which is used in the production of chocolate and ice cream and in the cosmetics industry. Macadamia is not only the world's most expensive...