Antique Setting for Aquamarine?

[NYPrincess]

I have found an antique platinum setting that is stunning for my latest project---an aquamarine and diamond ring. My question is: how difficult would it be to find a nice quality aquamarine stone to fit this mounting? And also, what vendor should I contact? Any assistance would be helpful.

Here is the link to the setting at Mel''s.

http://www.melsantiquejewelry.com/product_info.php/cPath/23/products_id/456

Please share your advice and knowledge.

Thanks.

NY