Rarity, AKA Miss Rarity AKA Sis AKA Marshmallow Pony, is a rising star among the Canterlot fine establishments, teacher at the Ponyville School of Friendship and Capitalist Queen Extraordinaire. Despite her surprising prestige and connections, few can ever out-charity Rarity: she'll give what she can give to anypony who needs it, even if they don't appreciate it at the time. Well, within reason. Don't ask Rarity-senpai for the tissue she just finished throwing away, you disturbing stalker.
Still, all this generosity has to be tempered with enough horse sense to retain the bits to pay for the next meal and keep the roof over her head, and it just so happens that opportunity is coming-a-knocking with a special competition being held in Canterlot: a treasure hunt sponsored by one of the descendants of the Collector, Canterlot's greatest gem collector! Whoever manages to find the legendary treasure will have access to rare gems that barely ever get seen even in Canterlot, as well as a not-so-inconsiderate sum of a million bits, just in case anyone like Spike would rather sample some gourmet gems and commits a rather grave geological faux pas.
Gleeful at the opportunity for a chance to use these rare gems in her dresses to rake in the bits for a limited time only, Rarity decides to exercise her magic talents, physical prowess, and willingness to crush the weak under her hooves, all well-exercised in previous battles of wits such as Monopoly, to seize the prize. Can she do it? Only time (and a lot of horse sense) will tell...