Emphasizing a gtk.Label

[ravenheart]

I want to give some emphasis to a Label from gtk, without breaking gnome 
theme (i.e. not changing colors, etc)
I think bolding it would be a good option (could be also underscoring 
but don't like it at all).
What would be the best solution? How to do it? I have found how to 
change colors and underscoring but nothing else.
Thanks.
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