User blog comment:12th Supernova/Chapter 782: Family Values/@comment-4374114-20150402143402/@comment-130.102.158.12-20150404035836

That is a good point. Seastone has always been touted as more or less the strongest material there is. Nothing ever cuts it. It would be very uncomfortable if birdcage was stronger than seastone.

That brings me to another question. How DO they make seastone cages and buildings if nothing can cut seastone? And if they can make cages and buildings out of seastone, why not a seastone sword that would then be able to cut seastone.......