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I had been to us recently.I bought some corals and jades there.We get good quality pearls(akoya pearls and freshwater cultured pearls) in us beach areas.(like sf and sandiego).Regarding corals and jades -italian corals(beads and rose shape) and canadian jades are very good in quality.
Even cheaper varieties of corals and jades and pearls are available but these are much cheaper in india.
If you really want to buy good quality pearls you can browse Indus ladies shopping mall and also amazon.com and ice.com. to have some idea.