Precious stones in a pack of cards

Why this works

The riddle cleverly plays on the double meaning of "precious stones" and the suit of cards. In a standard deck, diamonds are one of the four suits, and they are often associated with precious gemstones, which adds a layer of wordplay. So, when you think of "precious stones," it not only evokes the idea of actual gemstones but also hints at the diamond suit in cards, making "diamonds" the perfect answer!