User blog comment:Waters Knight/Monty Tweets About 'Dust Levels'?/@comment-5054402-20140514145150/@comment-11188061-20140514151440

Pretty certain Semblances are strongly tied to a person's Aura. Assuming that at Aura 1, a person (like Jaune) may eventually unlock his Semblance 1, though it takes time since a Semblance seems to reflect the person's greatest needs or desires.

I'm also sure that it's possible to combine both Dust and Semblance and use them together the way Weiss and Glynda did. It's an advanced technique, if only because people's Semblance are mostly unique to each other (there should be general categories though) and thus require testing and tuning to enhance them with Dust.

Lastly, this is speculation, but if Yang is Semblance 2 High, Blake and Ruby Semblance 2 Medium, then Weiss should be at Semblance 2 Low. Just a hunch - In the White Trailer, Weiss tried to beat the Giant Armor with almost no usage of Dust at all (wanted to do so with just her glyphs) but in the end accepted the fact that she could not do so, and did the one thing she's good at - creating multiple powerful effects by enhancing her Semblance with Dust.