Can last up to 4-5 months. If they can't be used instantly, truffles will last a few days - at the newest, up to two weeks for the sturdier black truffle - stored in paper or sealed containers. The cool coastal areas of Northern California provide an ideal surroundings for black truffles to develop. 1. France: Known for its black truffles (Tuber melanosporum), notably from the Périgord area. How Much Is 1 Black Truffle? Says Gal, each one of her Chocolate Jewels is a "miniature composed dessert...