The "Jack of Diamonds" is a playing card from a standard deck, representing one of the four suits: diamonds. In card games, the Jack typically symbolizes a young man or a servant and is valued between the 10 and Queen in most games. In a standard deck, the Jack of Diamonds features a figure holding a weapon or a tool, often depicted in a colorful design. This card is commonly used in various games, including poker, bridge, and solitaire, and can have different meanings depending on the game being played.