The tiffany ones are NOT equal length and width wise... think about it, that would make it a + !! I can tell you with 100% certainty that they aren't! No cross is... 

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weird, right?
I think the ebay measurements make sense, at least!
Anyway, I only mentioned the measurements because it seemed like something you were listing as a "pro" for Tiffany. So, if the measurements are actually quite similar between the two crosses, then that factor gets taken out of consideration..... therefore: I would go with the Blue Nile cross and use the rest of that money for something else that I love-- maybe even something from Tiffany!
Yes - like maybe a Tiffany chain to use on the Blue Nile cross.![]()