Comparison

Diamond Sword vs Iron Sword

Minecraft 1.21.8. Java Edition values.

Verdict

Diamond hits for 7 vs Iron's 6 — a ~17% damage bump — and lasts 6× longer (1,561 vs 250 uses). Worth it the moment you have 2 diamonds to spare. Diamond also accepts richer enchantments via the Smithing Table upgrade path to Netherite.

Side-by-side stats

Highlighted cell wins that row.

StatDiamond SwordIron Sword
Attack damage76
Attack speed1.6/s1.6/s
DPS11.29.6
Durability1,561250
Enchantability1014
Mining tierDiamondIron
Survives lava (as dropped item)NoNo
Crafted fromDiamondIron Ingot

When to pick each

Pick Diamond when…

You have at least 2 diamonds and aren't saving them all for a pickaxe. The damage edge and durability mean you can fight bosses (Wither, Iron Golems) without breaking mid-fight.

Pick Iron when…

You're still diamond-hunting. Iron is cheap, smeltable from any iron ore, and good enough to bridge until your first diamond. Don't waste your diamond on a sword if you don't have a pickaxe yet.

Get these tools

Diamond Sword
Iron Sword

Other tool comparisons

FAQ

When should I choose Diamond Sword over Iron Sword?
Diamond hits for 7 vs Iron's 6 — a ~17% damage bump — and lasts 6× longer (1,561 vs 250 uses). Worth it the moment you have 2 diamonds to spare. Diamond also accepts richer enchantments via the Smithing Table upgrade path to Netherite.
How much damage does a Diamond Sword do?
7 attack damage with 1.6 attacks per second — 11.2 DPS at full charge. That's 1 more than a Iron Sword (6 damage).
What's the durability of a Diamond Sword?
1,561 uses before it breaks. That's 1,311 more than a Iron Sword (250 uses). Unbreaking III roughly multiplies durability by 4.
Do I need Diamond Sword if I already have Iron Sword?
You have at least 2 diamonds and aren't saving them all for a pickaxe. The damage edge and durability mean you can fight bosses (Wither, Iron Golems) without breaking mid-fight. If those don't apply, you're still diamond-hunting. iron is cheap, smeltable from any iron ore, and good enough to bridge until your first diamond. don't waste your diamond on a sword if you don't have a pickaxe yet.