B2 [ C or U ] a transparent, extremely hard precious stone that is used in jewellery, and in industry for cutting hard things钻石，金刚石
jewellery made from diamonds钻石珠宝；钻饰
The large central diamond is surrounded by eight smaller stones.
His father struck it rich in the diamond business.
He gave her a hugely expensive diamond ring.
It was a beautiful necklace with a diamond pendant.
A large diamond glinted on her finger.
B2 [ C or U ] a shape with four straight sides of equal length, forming two opposite angles that are wide and two that are narrow菱形
[ C ] the square part of a field on which baseball is played, surrounded by the four bases, or the whole field on which the game is played棒球场，棒球场地
one of the four suits in playing cards, represented by a red diamond shape（纸牌的）方块
[ C ] a playing card from the suit of diamonds一张方块牌