I've got one hand-shaped flattened tab black Devardi bead, completely metalized, with a melted in spot of Brad's striking glass color on one side & a really nice "round raised bead" of the same frit on the other side & it's been smashing around in my coat pocket for over a week now--with below freezing weather outside & 75+ degrees in my house (thermal shock anyone?) & it's FINE. It was made on a mini CC in Rockland & properly annealled.
I'm happy with that "test".
(the bead's nothing special to look at--but as far as "is it gonna survive", my guess is "yep"
)