Saxonous wrote: Glass is a bad example, because magic, in canon, doesn't deal well with it, to the point (If memory serves) that CrTe cannot make glass. So it goes....
I'd like to see the citation on this one, too. Your definition of "canon" seems to involve a lot of house rules and imagination...
Saxonous wrote:...The thing to watch out for here is that pearls are "worth" more to magi because they can hold more Vis, being considered a gemstone in canon...
I have to wonder if your "canon" rules on glass are equally unsupported by anything other than an equally creative leap between two otherwise unconnected sections of the rules.

