Sapphire Shores

Sapphire Shores is an Earth Pony who is a famous popstar in Canterlot. She first appeared in A Dog and Pony Show, walking in Rarity's shop after hearing about the Unicorn. She is fascinated by Rarity's newly made diamond garment and wants to buy it for her tour, but soon said she'll buy five more of them in different colored gems along with it, unaware that Rarity doesn't have enough diamonds to make new garments, which leads to the events of the episode.