A unit of weight for precious stones, and, sometimes, precious metals; one fifth of a gram.

【美】克拉；开(为宝石及贵重金属等重量之单位，等于一公克之五分之一)。

A 24th part: used to express the fineness of gold.

开金(为纯金成分之单位，纯金共含廿四开金，每开为纯金之廿四分之一)。

Same as karat.

亦可作 karat。