[rini17]

Right and when one shell breaks, the shrapnel breaks the other ones and everything around:)

[dreamcompiler]

Well, they'd implode (the gas inside is at a partial vacuum) so most of the shrapnel would travel inward. But yeah, diamonds are hard but not tough. It's possible that a kid with a BB gun could shatter such a craft with one shot.

But they'd certainly look cool.