The bowl of the confiture is free-blown and shaped, it is also quite fine.
It can't have been easy getting lenses cut
onto the corners - that's an area where internal stresses and weaknesses can be created and come into play.
It's a very pretty and delicate thing.
My pics of the thistle glasses do not show them at all well.

I do find one of the best ways to get a cut to show up IS to hold it up against a grey sky.
