Talk:Spike/@comment-71.166.14.97-20111117013822/@comment-184.77.52.75-20111118015127

Spike eats precious stones (Saphires, emeralds, etc.). The daimonds on Rarity's flank is enticing to Spike, so as a cutie mark it's always there, oogled by Spike whenever he's there. Like other answers, it's not just that or her hair alone. Spike just likes Rarity overall, especially when she can find those precious stones. Wow, I rhymed.