2 sentences for 成色 (chéng​sè — fineness)

1. 这块家传的金牌成色十足，非常珍贵。

   zhè kuài jiā​chuán de jīn​pái chéng​sè shí​zú, fēi​cháng zhēn​guì.

   This heirloom gold medal is of high purity and is very precious.

   Source: Dong Chinese Dictionary

2. 这种金饰品的成色很高，足有九成以上。

   zhè zhǒng jīn​shì​pǐn de chéng​sè hěn gāo, zú​yǒu jiǔ​chéng yǐ​shàng.

   The purity of this gold jewelry is very high, at over 90 percent.

   Source: Dong Chinese Dictionary