This is How Diamonds are Made english documentary Part 3

https://www.youtube.com/watch?v=bTwpJfintek
https://www.youtube.com/watch?v=bTwpJfintek
https://www.youtube.com/watch?v=QGTQvYRH4qA
https://www.youtube.com/watch?v=iPKAmMoiecg
https://www.youtube.com/watch?v=Vj0SJCEo2Bc
https://www.youtube.com/watch?v=ZhLTlgcxEQw