Artist’s desc:
 
Here’s my design for Diamond Tiara, professional rich girl/smack-talker. Considering she’s a senior in pony high school now, she has traded in her childhood crowny-thing for a slightly more understated diamond encrusted headbandy-thing.
 
I also threw in some comparison sketches for Diamond versus Silver. In general I wanted Diamond to appear more intense (smaller eyes, sturdier chin) and physically stronger than Silver, to recall the physical differentiation between Apple Bloom and Sweetie.