A diamond is a hard, bright, precious stone which is clear and colourless. Diamonds are used in jewellery and for cutting very hard substances.
双语例句
例：
a pair of diamond earrings.
一对钻石耳环。
2.?[C 可数名词] 菱形
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°: ?.
双语例句
例：
forming his hands into the shape of a diamond.
用他的双手比划出一个菱形。
3.?[U 不可数名词] 方块（扑克牌中的4个花色之一）
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.