Diamonds: first uses

It could have been produced in China, 2500 BC, as part of a tool used to polish hunting tools.

The speculative theory is based on the discovery of remains of other precious stones identified by analyzing particles embedded in axes dated more than 4,500 years ago.

The similarity of the polish achieved in a test on a fragment of these weapons, and its comparison with the result of the work done by Stone Age men on the same, shows a result closer to the original when using diamonds instead of rubies or sapphires, the other identified materials.