Portrait of Adele Bloch-Bauer I. The item "2015 Niue 2$ The Most Expensive Painting in the World 2oz Proof Silver Coin" is in sale since Saturday, July 21, 2018. This item is in the category "Coins & Paper Money\Bullion\Silver\Coins". The seller is "midnightangel128" and is located in Elk Grove, California. This item can be shipped worldwide.