4 sentences

1. 这枚戒指是纯金做的。

   zhè méi jiè​zhi shì chún jīn zuò de.

   This ring is made of pure gold.

   Source: Dong Chinese Dictionary

2. 这枚戒指是纯金的。

   zhè méi jiè​zhi shì chún jīn de.

   This ring is made of pure gold.

   Source: Dong Chinese Dictionary

3. 他的领带卡是纯金制作的。

   tā de lǐng​dài qiǎ shì chún jīn zhì​zuò de.

   His tie clip is made of pure gold.

   Source: Dong Chinese Dictionary

4. 那是纯金吗？

   nà shì chún jīn ma?

   Is that pure gold?

   Source: Tatoeba