The earrings are great! I love those funky, odd shaped baroques! The necklace looks too man made to me, but if you bought it for about $20-30 bucks not counting shipping and duty, if your country has duty charges. In any case shell pearls do fool the eye of those who don't know pearls, so you will look fine wearing them.
A friend of mine turned down the chance to look at Tahitians at the Tucson Gem Show with me, and instead bought a shell pearl version (It was about 13mm and flawless) for about $100 dollars and I never had the heart to tell her- and no one else ever noticed, either. She way overpaid, but at $100, she honestly thought she got Tahitians.
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