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Thanks for your inputs, I agree that it seems odd that an acid test on pearls could be considered nondestructive. I have yet not tested this myself and I do not know of anyone who has, I was told about this test by someone who in part had heard it from someone else and none of us know of any...

Jan Asplund, Gemologist and gemstoneprospector at Sheba Gems and teacher of gemmology, geology and stonecutting at Kristallen, Sweden.

I have heard that it is possible to distinguish Saltwater from Freshwater pearls with a simple test that is said to be nondestructive. It tests the amount of manganese wich is greater in freshwater than in saltwater pearls. Mangansese teststrips are used together with dilluted hydrocloric acid...