I've worked with gems and cutting for a while and this is what I have to say:
Truth be told, it depends on the buyer. If he is a collector he might be willing to pay a premium for certain locales. If he's just a "average guy", he most likely won't.
When I buy rough I don't think to much of the origin other then avoiding conflict zones.
I rarely pay a premium for a locale unless I know there's money in it for me and then I usually have to wait years before that collector comes by to pay that premium.
I mean, for example: If I can get a similar zircon at 5 cts from xxx or yyy why should I pay a premium from either? I won't, I'll buy the cheapest.
Now, on the other hand: If I can buy a ethiopian opal or a similar australian opal but the aussie commands a higher price, will I pay it?
Yes I will. I know the aussie opals are getting more scarce and are less likely to crack on me. Basically it evens out the risks.
I also want to add that marketing is a huge thing and properly marketed that locale may command a premium just due to that.
Look at tanzanite, which has been marketed quite well.
I hope that gives some food for thought from a cutters point of view.
