3 sentences

1. 这些珠子是用人造材料制成的。

   zhè​xiē zhū​zi shì yòng rén​zào cái​liào zhì​chéng de.

   These beads are made of synthetic materials.

   Source: Dong Chinese Dictionary

2. 她用红色的珠子串成了一串手链。

   tā yòng hóng​sè de zhū​zi chuàn chéng le yī chuàn shǒu​liàn.

   She used red beads to make a bracelet.

   Source: Dong Chinese Dictionary

3. 他在海边捡到一个贝壳，发现里面有一颗珠子。

   tā zài hǎi​biān jiǎn​dào yī gè bèi​ké, fā​xiàn lǐ​miàn yǒu yī kē zhū​zi.

   He picked up a shell on the beach and found a pearl inside.

   Source: Dong Chinese Dictionary