User blog comment:PUNCHURPREGNANT/Gray and Silver Predictions/@comment-188.23.168.236-20140330225649

I don't know if anyone ever mentioned this or if it turns out to be relevant, but keep in mind that Gray almost always - even half-naked - wears a necklace. This is by chance also the most consistent piece of equipment Gray has since the very beginning of Fairy Tail. If we take the information of OVA 6 as canon material, than it is officially confirmed that it's a silver necklace Gray acquired some time before he meets Lucy, but after the events of Memory Days (OVA 3), because he isn't wearing any necklace in his childhood flashbacks.

My theory behind it is that the relationship between Gray and Silver could be so complex and fuzzy but important that Gray is unconsciously very fond of anything out of silver.