[Have a creepy stealthy rage filled positively adorable little earth girl suddenly speak up from right beside you, Uhura.]

Pardon me, but is it normal to want to stick foreign metals in your ears? How do you know you aren't allergic to...whatever that is?

[She's got earrings of her own, so it's probably a safe bet to assume she's referring to the material. Considering all the weird things around here compared to her experience with Earth, she sees no reason to assume they're using familiar metals from earth.]