Rarity

Rarity (voiced by Tabitha St. Germain) is a unicorn pony with a pure white body, dark blue eyes and a royal purple mane and tail which are combed in wavy curls most of time, and speaks with an English accent. She is a fashion designer and seamstress at her own dressmaking shop, The Carousel Boutique. She is very stylish and beautiful, takes great interest in fashion and clothing design, and often tries to make herself the center of attention. She considers herself a proper lady and often acts in a sophisticated manner and can also be dramatic and histrionic. Rarity is Sweetie Belle's older sister, and often takes care of her when her parents are away. She once hopes to marry Princess Celestia's nephew Prince Blueblood, until she actually meets him and found he is snobbish, rude, and self-centered.

Rarity's magic includes telekinesis and the ability to find jewels buried underground. She represents The Element Of Generosity and has a persian cat named "Opal," who dislikes Rarity but adores Fluttershy. She realizes Spike's crush on her, and is even fond of him at times.

In The Cutie Mark Chronicles, Rarity was a pony assigned to design costumes for a play, but they lacked "sparkle" until her horn magically pulled her to a massive stone boulder, Rainbow Dash's Sonic Rainboom broke the boulder revealing a stash of gemstones, which Rarity used for the costumes and revealed her special unicorn power of detecting them like a dowsing rod thus granting Rarity her Cutie Mark.

Source: http://en.wikipedia.org/wiki/List_of_My_Little_Pony:_Friendship_Is_Magic_characters