After restoring the tiara to its place, it occurred to him that, if this was hidden here, it was likely hidden by humans. That being the case, they probably didn't want him to have it, so he better hide it.
Thankfully, the glowing disappeared when he picked it up, so he didn't have to worry about it when he put it in his belt-pouch.
Turning to Karyn, he said, "We better find out what this does. I hope there are some other elves here that are a bit more knowledgeable than my maids."