3 sentences

1. 这种黄金的纯度非常高。

   zhè zhǒng huáng​jīn de chún​dù fēi​cháng gāo.

   The purity of this gold is very high.

   Source: Dong Chinese Dictionary

2. 虽然这枚戒指很小，但它是由纯度极高的金子打造的。

   suī​rán zhè méi jiè​zhi hěn xiǎo, dàn tā shì yóu chún​dù jí gāo de jīn​zi dǎ​zào de.

   Although this ring is small, it is crafted from extremely high-purity gold.

   Source: Dong Chinese Dictionary

3. 这种机器能从矿山采集的金矿中分离出高纯度的黄金。

   zhè zhǒng jī​qì néng cóng kuàng​shān cǎi​jí de jīn​kuàng zhōng fēn​lí​chū gāo chún​dù de huáng​jīn.

   This machine can extract high-purity gold from the gold ore collected from mines.

   Source: Dong Chinese Dictionary