Diamond ore is a precious material in Total Miner: Forge.
It's rarity and the fact it is needed for most high-tier tools means it sells for a reasonable amount. Diamond ore appears most commonly in veins of 1-10, and from depth 700 and below. Technically, diamond is the strongest material in Total Miner: Forge as Titanium and Ruby only strengthens the pickaxe, and isn't the actual material used for mining. Diamond shovels and diamond hatchets are the strongest of their tier, derp derp derp. I talk too much.
For the gemstone, see Diamond (Gem).