18k金合金中含有75%的黄金,所以它是一种真正的黄金合金。18k金还包含其他金属,如铜、镍或银等,这些金属的添加可以使18k金更坚硬和耐用,同时也影响了它的颜色和光泽。因此,如果你要购买纯度高的黄金,可以选择24k或22k黄金,但如果你更注重耐用性和佩戴舒适性,18k金也是一个不错的选择。无论购买哪种黄金,最好到正规的珠宝店或黄金投资渠道购买,并要求提供相关的证书和质量保证。
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