When a landslide hits the Pie Family Rock Farm following the previous night's rain shower, Maud of all ponies becomes troubled after seeing so many different crystals all at once. It was because of how the glow they gave off remind her of Rarity, and the time they spent in Manehatten. Although she did an amazing job at not showing it to anypony face to face, Maud would be emotionally touched anytime something shiny came into her view. Considering the sudden change of events, however, she hadn't much choice but to be near them. After sifting through numerous amounts of gemstones scattered as far as the eye could see, Maud ends up finding possibly the most beautiful diamond of them all, and aims to send it to Rarity as a gift.
The only other pony to discover all of this was even happening would be Marble, Maud Pie's sister.
Special thanks for slight assistance in the first few chapters goes to Socks.