Truffles are like diamonds, the larger the piece the more expensive it is. Also whole truffles cost more than truffles which broke as they were being unearthed.
Class A truffles weigh between 20 and 99 grams, they are in perfect condition having been extracted from the earth in one whole piece.
Class B comprises two kinds of truffle, whole truffles which are small in size ( under 20 grams ) and larger truffles which are broken or have been cut.
Class Extra are whole truffles which weigh 100 grams or more. These can weigh up to 350 gr