Talk:My Little Pony: Friendship is Magic (comics)/@comment-26973802-20130531052641/@comment-1669199-20130603222846

Perhaps Spike stopped by at Rarity's home to pick up the gem before traveling to the moon with the Mane 6 and Luna because he felt that it would've been wise to take it with him. I don't recall him having the gem before the journey, before Rarity was kidnapped, along with that suit of armor of his that he lost along the way (this explains the bag he was seen carrying in the beginning of issue 6, prior to going up to the moon).