CrystalVioletVelvet came up with the idea and I made it true. I like how I made her.
What do you think guys?

She also made the discription for her:

Diamond Spark (Twilight Sparkle + Rarity)
Diamond Spark took Twilight’s intelligence and Rarity’s charm. She has a photographic memory and great attention to details; also a professional liar and a good psychologist. All of those traits make her the best investigator all around.
She is also very aristocratic and lady-like; no one will deny her beauty, and she’s a well educated pony with great taste in… well, everything.
Diamond Spark is perhaps one of the greatest mages in history, even greater than Twilight on her own. When it comes to telekinesis, she can raise massive objects, as well as operate the extremely small ones. She is also very good at crystal magic.