Quote Originally Posted by WineGuyD View Post
The question was whether a natural combo that has two clearly defined stones is more or less valuable than one that gradates between the two.
That depends, if it is genuinely a true natural I would say there is no difference. If you have an eye loupe or a microscope take a look at the seam to confirm it one way or the other. While the 'true' natural formed by metamorphic forces has more 'cool' factor it is not better than a glued combo. It may not be as good as some individual stones or it may be better. IME with a couple of dozen there have been slight differences but they have all been reasonably close in performance.