There are already a bunch of threads discussing both, so... I am only too happy to throw in some authoritative input from a most famous gemological laboratory to settle it all.
Have fun, folks!
Click for the thing here
and to get the full picture,
go to the source.
PS. I meant this to be just for fun.. no idea what side has it right, or even if a 'right' side to the story exists at all. Leaving that bit to y'all.