IC2 Diamond is IndustrialCraft 2's diamond item, OreDictionary-equivalent to vanilla diamond, used in Diamond Drill, Iridium tools, and Quantum Armor recipes.
Guide
Smelt three iron ingots and combine them with two sticks at a crafting table to make an iron pickaxe — the minimum tier required to harvest Diamond Ore in both 1.7.10 and 1.12.2.
Dig down or use a branch-mining tunnel at altitude Y between 5 and 12 to maximize Diamond Ore exposure. Carry torches to prevent mob spawns and bring water buckets for lava pockets.
Break Diamond Ore with the iron pickaxe to drop one IC2 Diamond (or vanilla diamond — they share the gemDiamond OreDictionary tag and stack together in IC2 recipes).
Use IC2 Diamond in recipes for Diamond Drill, Diamond Block Cutting Blade, advanced circuits, Iridium tools, and the Quantum Armor crafting chain via the standard 3x3 crafting grid.
Configure item pipes (BuildCraft, Ender IO) to route gemDiamond rather than a specific item ID — both ic2:diamond and minecraft:diamond will be accepted by the same filter.
IC2 Diamond registers under gemDiamond, so vanilla minecraft:diamond is a 1-for-1 substitute in every IC2 recipe. There is no need to convert stacks manually.
Functionally yes. IC2 Diamond is registered as ic2:diamond but shares the OreDictionary tag gemDiamond with minecraft:diamond, so the two items stack and substitute freely in every recipe that references gemDiamond.
Mine Diamond Ore at altitude Y ≤ 16 with an iron pickaxe or better. The drop will be IC2 Diamond or vanilla diamond depending on which mod's loot table fires first — both are interchangeable for IC2 recipes.
It is consumed by the Diamond Drill, the Diamond Block Cutting Blade used by the Block Cutting Machine, advanced circuit variants, the Iridium tools chain, and the Quantum Armor crafting line.
IC2 ships ic2:diamond in IndustrialCraft 2 builds for Minecraft 1.7.10 and 1.12.2. Newer Forge versions deprecate the duplicate entry in favor of OreDictionary unification.
Yes if you filter by the OreDictionary tag gemDiamond. Filtering by raw item ID (ic2:diamond vs minecraft:diamond) will split the streams, so always prefer the OreDictionary filter on automation pipes.
No — different item IDs cannot share an inventory slot even when OreDictionary-equivalent. They coexist in adjacent slots and are interchangeable only at the recipe layer.