I knew the origin and I don't think that can be dismissed. To be honest, I never thought anything of it until Roch first mentioned it a few weeks ago, That's why I thought it was 'interesting'.
I think it will be though, by some.
It's quite alarming Bamber knows little details about the crime scene - things he shouldn't know. This isn't the first time he's been shown to do so.
Ironically I think if all those who had letters from Bamber, clubbed those letters together - then the supporters could shut the case.
Not surprisring that Roch didn't want to reveal the origin of this earring talk (if he even actually knows it's origin) - because it doesn't make Bamber look good.