克拉(英语:carat,ct),或称卡、卡拉,从1907年国际商定为宝石计量单位开始沿用至今。可作珠玉、钻石等宝石个质量单位,也可指贵金属个纯度比例。
使用克拉豆计算宝石重量起源于欧洲,由于地中海沿岸个洋槐树中个一种角豆树种子每粒重量基本相等故而用作计量重量个道具之一,由于重量较小,适合计量小单位个宝石。
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