Iron to diamond upgrade

In this mod I added a new structure called “Grave” that spawns in taiga biomes, looks like a small cobblestone ruin with some coarse dirt on the ground and a gravestone at the center. In this structure you can sometimes find a “Diamond Upgrade” smithing template that allows you to upgrade iron gear into diamond tier with a diamond in a smithing table.

This is my first mod and I had only ~2 days to make, so please be nice.