It very hard. It used in jewellery and also in cutting machines?

It very hard. It used in jewellery and also in cutting machines?

1. quartz
2. diamonds
3. slate
4. Semua jawaban benar
5. Semua jawaban benar

Jawaban: B. diamonds.

Dilansir dari Ensiklopedia, it very hard. it used in jewellery and also in cutting machines diamonds.