A diamond is a hard, bright, precious stone which is clear and colourless. Diamonds are used in jewellery and for cutting very hard substances.

Diamonds are jewellery such as necklaces and rings which have diamonds set into them.

A diamond is a shape with four straight sides of equal length where the opposite angles are the same, but none of the angles is equal to 90?:

Diamonds is one of the four suits of cards in a pack of playing cards. Each card in the suit is marked with one or more red symbols in the shape of a diamond.

In baseball, the diamond is the diamond-shaped area of the playing field between the four bases.