Small diamonds, also known as TREYS, are a type of playing card. They are the third-lowest ranked card in a deck of 52 cards, and are represented by a three-pointed symbol. TREYS are often used in card games such as poker, bridge, and blackjack. They are also sometimes used in solitaire and other card games. Small diamonds are also used in jewelry, where they are cut into small shapes and set into rings, necklaces, and other pieces of jewelry.