Azura builds?

Of your builds, I'd be included to go for Slaying but I'd suggest +Spd with a Harmonic Lance. She can reach impressive speeds to double quite a lot for +10 damage. I got loads of her on L!Lucina's banner and build the below, she's got lots of C slot options too.

I am not really interested in checking these builds because this site has everything you need, but I want to point out that gem weapons are situational weapons: you use them when you want to counter a certain type of colour. Typically, gem weapons are very good in AA. They also aren't too bad on dancers, since you generally use them to, you know, dance. They don't need to be versatile.

Look me straight in my eyes and then look at this Libra and say again that Emerald Axe suckz.

My Libra can EASILY clap your Azura.
(I'm just joking though. But for real my Libra looks something like that and works pretty well.
Gem weapons are pretty situationally.
I use my Libra when some lance boi thinks he's good at this game.
And I second the idea of Mr.Universe above.)

I gave mine Slaying Lance +Spd because I'm not a fan of gem weapons either, but I regretted it later because all she does is refresh, she rarely sees combat.