Seastone weapons are rare in One Piece, mainly used by Smoker. Crafting Seastone weapons is difficult and they may not be worth the effort. Seastone weapons can be used with Haki, but are overshadowed ...

Out of the three types of devil fruits in One Piece—Logia ... few people in the series who use weapons made out of seastone. The most notable among them is Smoker and his infamous Jitte.