Someone screwed up hard.

She’s goin’ nova, Cap’n!

@Background Pony #5F9A
 

Celestia: You killed my sister, then my niece, then you even killed Twilight! You’re gonna regret what you’ve done, Grogar! ‘Cause now I’m mad! I’m really really mad!!! And now it’s time….
 
TO PAAAAAAAAAAYYYY!!!!!!!

Celestia going into final form mode.

“I feel like I live in a world made of… cardboard. Always afraid to break something, or somepony. Never allowing myself to lose control, even for a moment, or somepony could get hurt. But you can take it, can’t you, big guy? What we have here is a real opportunity for me to cut loose and show you just how powerful I really am.”

Princess of Cinder.

Grogar: So Celestia, your sister is dead. Your student and her meddling friends are dead. Your niece, her precious knight, and her bouncing baby brat are dead. Equestria and The Crystal Empire lay in ruins. What are you going to do now?
 
Celestia: (barley holding back tears) I am going to show you why there is nothing more dangerous in this or any other world than a being who has nothing left to lose.

The gold is literally melting there.

I wanted this in the show so much.

Dang.

H  
Hgh

Whoever made her so angry, that she starts buring as hot as the sun, is gonna have a bad time!

Someone is about to feel the burn!

@Tirek  
I think its clear that Celestia and Luna use magical gems for their outfits.

@Blissey1  
See also:
 

now this is impressive

I’ve never seen such a vivid expression of anger before, very well done!

@Red-Supernova  
yes, the crown shouldn’t be a problem to be replaced. It’s just gold  
I’m more interested in the gems. In my headcanon, there are 2 kinds of gems in Equestria: common gems (to pay stuff or a tasty snack for dragons) and magical gems. I wonder what kind of gems Celestia has in her regal outfit

@Red-Supernova
 
If she retrieves the melted gold after her rage, I’m sure it could be melted and re-cast into new jewellery.

@Red-Supernova  
Being the leader of a nation has it’s benefits.
 
The real challange is going to be getting all that molten gold out of her coat. xD

So is Celestia’s jewelry replaceable?

Such a moment was what I expected in the series … well, at least it happened in the comics.

I’d pity the poor soul whom tempted the sun’s rage,  
Yet I believe actually acheving such a reaction voids any necessity for said pity. ^^