伦敦金纯度表示法
关键字：伦敦金纯度
黄金饰品一般分为足金和K金。K金（或开金）是黄金与其他金属熔合而成的合金。“K”是国际上用来表示伦敦金纯度（即含金量）的符号，那么1K的含金量是多少呢？国际上是把24K金当作含金量100％来计算的，所以1K的含金量为100／24＝4.1666％。我国市场上最多见的“18K金”，其含金量为18×4.1666＝75％，饰品上应打上的印记为“18K”或“750”。国家标准“GB11887-8P”规定：含金量不小于990‰为足金，含金量不小于999‰为千足金。99.95%以上可以称为纯金。
伦敦金纯度表示法的种类：
1.用”k金”表示伦敦金纯度
国家标准GB11887-89规定，每开（英文carat、德文karat的缩写，常写作”k”）含金量为4.166%，所以，各开金含金量分别为（括号内为国家标准）：
8k=8*4.166%=33.328%（333‰）
9k=9*4.166%=37.494%（375‰）
10k=10*4.166%=41.660%（417‰）
12k=12*4.166%=49.992%（500‰）
14k=14*4.166%=58.324%（583‰）
18k=18*4.166%=74.998%（750‰）
20k=20*4.166%=83.320%（833‰）
21k=21*4.166%=87.486%（875‰）
22k=22*4.166%=91.652%（916‰）
24k=24*4.166%=99.984%（999‰）
24k金常被认为是纯金，成为”1000‰”，但实际含金量为99.99%，折为23.988k。
2.用文字表达伦敦金纯度
有的金首饰上打有文字标记，其规定为：
足金–含金量不小于990‰
千足金–含金量不小于999‰
有的则直接打上实际含金量多少。
3.用分数表示伦敦金纯度
如标记成18/24，即成色为18k（750‰）
如标记成22/24，即成色为22k（916‰）
4.用阿拉伯数字表示伦敦金纯度
如99–表示”足金”
如999–表示”千足金”
本文来源： 大田环球贵金属
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