I wanted to add another tier of tools/weapons (beyond iron) to the game for a long time, but I could not decide what kind of tools it should be. I though about bronze, steel or titanium but they all had problems. Bronze would require adding tin, which is uninteresting on its own and looks just like iron. Steel would look like iron as well, plus there wouldn’t be any new minerals to find. Titanium is “too techy” and it doesn’t look any different either. So I was undecided, until someone suggested adding diamonds and using them to create diamond edge tools! I think this is the best idea so far and I decided to quickly put it in 1.12 as a bonus feature.
Diamonds can be used to create diamond edge tools by taking iron tools and surrounding them with 3 diamonds. Diamond tools are only slightly more powerful than iron tools, but they are much more durable.
I plan to submit Alpha 1.12 later today.