2 sentences

1. 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

2. 这种首饰是由纯白银打造的。

   zhè zhǒng shǒu​shì shì yóu chún bái​yín dǎ​zào de.

   This jewelry is crafted from pure silver.

   Source: Dong Chinese Dictionary