During these seasons, Black Truffles grow at their best ranging from 7 to 9 centimeters in diameter and could weigh from 80 grams to 100. Because of the rarity of this mushroom, the production of Black Truffles has been made almost exclusively in the European countries. Black truffles are sold for about 1,000 per kilo when bought in the farmer's market. Despite that lack of proof of the truffles mystical power, their smell makes you want to inhale it over and over. It s difficult to exactly describe the smell. All you can say is that truffles smell pungent, earthy, musky, and sensual. That being said, you can more accurately say that people perceive the aroma of the truffle based on the olfactory response it evokes, not so much on its real smell. For example, black truffles when still young would have red exterior color with the inside white instead of black. This would be during early spring. Upon September to November, the black truffles would turn into dark grey or black with white veins. This is a sign that the truffles are mature enough to harvest and to eat. Truffles are usually in a size of a walnut to a potato or apple. The world s biggest truffle was found in Italy on 2007, weighing 3.3 pounds. It was bought by billionaire Stanley Ho, when the truffle was put up for an auction in Macau. It was sold for a staggering $330,000. There are different varieties and may look different based of their kind. Then there are also other varieties or species of truffles which are not commonly used including the black truffle or the tuber macrosporum and the scorzone truffle or the tuber mesentericum. These types are commonly found in the U.S., specifically in the Pacific Northwest, for commercial and recreational uses. The summer variety is cheaper than the winter variety, so it allows for more culinary consumption and experimentation. Summer black truffle - This truffle type may seem inferior to its winter counterpart, but it is still a palatable and flexible culinary wonder, so does other types of truffles. Usually harvested from May to August, summer black truffle is entirely a different species from the winter variety.