2 sentences for 白金 (bái​jīn — platinum)

1. 这枚戒指表面镀了一层白金。

   zhè méi jiè​zhi biǎo​miàn dù le yī céng bái​jīn.

   This ring is plated with a layer of platinum.

   Source: Dong Chinese Dictionary

2. 这枚戒指是由纯白金制成的。

   zhè méi jiè​zhi shì yóu chún bái​jīn zhì​chéng de.

   This ring is made of pure platinum.

   Source: Dong Chinese Dictionary