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In chapter 402, page 8, Zoro and Usopp got cuffed together with a Seastone
cuff, but Zoro didn't cut it, and instead he suggested to cut one of their
hands.

At first I thought that maybe it's impossible to cut Seastone, but then I read
chapter 677 page 9, where Law can easily cut another person's Seastone cuff
(he is the only one that get caught by normal cuff). So why didn't Zoro cut
his, was it because he not strong enough?

Zoro

![Cuff'd!](https://i.stack.imgur.com/f5WMY.jpg)

Law

![Free!!](https://i.stack.imgur.com/nfqfL.jpg)


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one-piece
Why can't Zoro cut Seastone?


Kairoseki is as hard as diamond, as stated in Chapter 400 p 11, so it is
unlikely for Law to have cut it. However, it is a chain and nobody said that
the chain consists just of Kairoseki. It is highly likely that at most every
second chain link is effectively Kairoseki, since it is as hard as Diamond,
you could barely made it into a chain without any other material and after all
it is a rare material.


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2013-12-11T07:58:45.747
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Law can control everything in his _room_. He can even extract toxins from
someone's blood, so I guess he can also break chains with his mind/power even
without actually having to cut them. Law and admiral Fujitora just use their
swords for show anyway. They don't really need to cut something to activate
their powers as can be seen when he removed his own cuffs or when admiral
Fujitora was sending a meteor towards the straw hats while eating noodles.


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2014-07-02T12:05:32.883
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Any answer to this question would be pure speculation:

If it were that the entire chain is not made of seastone, any rational being
would make the cuffs portion of the chains seastone and, therefore, he would
not be able to cut the chains off without cutting seastone. This answer,
though already accepted, could be rationally excluded.

Whether it makes sense that his devil fruit power could have been used to cut
the chains is dependant on whether non-contact devil fruit abilities can
manipulate seastone. I don't believe they can but the way to determine that is
to look at smoker. Can smoker-san turn his entire jutte into smoke? If he can,
then this is how the chains were removed. If he cannot, he must have done it
by his own skill.

If a swordsman (combined with the strength of his sword/swords) is rated by
what he is able to cut, Law may have been able to cut the chains by his own
strength. His blade would touch the stones, not him. The seastone being as
hard as diamond does not mean it cannot be broken; hardness is not the same as
toughness. In other placed I would give better examples but for an anime site:
the blades used in Attack on Titan are a super hard metal yet fracture/dull
easily. Almost all very hard materials (especially stones and ceramics) have
fracture planes between grain boundaries along which the material can be
shattered or split with sufficient force. How did you think diamonds are cut?
Why could Law do this and not Zoro? Law at that point in the story was a
better swordsman by this rating criteria then Zoro was at the time when he
considered cutting his hand (or his leg, or his chest, or throwing himself
into a floating paw of pain... what is up with this guy?)

Finally please note that none of these explanations matter. One Piece is (and
I love this) governed by the "rule of awesome" and the "rule of funny". What
is possible and what the chains are made of is all what is fun for the
audience. Both referenced scenes were badass and awesome. Why could Law cut
the seastone and Zoro couldn't? Because it was a better show that way!


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None of the other answers actually answer the question. OP asked

> So why didn't Zoro cut his [seastone cuffs], was it because he not strong
> enough?

and not

> How could Law break the seastone chains?

If it really is just as hard as diamond, then Zoro should be able to cut the
seastone. He has cut metal before and clearly stated that diamond wouldn't be
any different.

But for this technique, he needs free hands. He has to slice in the right
angle, with the right amount of power to do it. The seastone on his arms is
simply to close to exercise any technique. But cutting flesh and bone on the
other hand, is an relatively easy task with a sharp sword. Besides what some
people may think, One Piece doesn't open plot holes for the Rule of Cool.


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