Silver necklase?
 

Not sure if you can make them or whatever but. During the murder mystery quest i found a way to keep the necklace you get during. Not sure if its a bug or not but you cant trade the item and stuff o_O

I use to do this with The "Shield of Arrav" and made money selling them. I would get the phoenix halves, he got the black arm halves, and then i sold them. I made like 700K, but then it was patched with the varrock graphic update in 2 days.

Lol the necklase is untradeable but looks sexy =p

Yeah, I don't know what you're talking about. A screeny would be nice.

All i had to do is keep them all with me, drop the ones i had, then keep getting it and dropping it over and over till i decided to pick them up. now they aren't trade able. :/

That's sweet! But you can't get it after the quest?

Once you've done the quest you cant get it.

EDIT:
http://i53.photobucket.com/albums/g64/Ploxinate/MMS.png