Oversized shell necklaces are making waves right now, and, no, they look nothing like tacky, touristy souvenirs. Think sculptural, statement-making shells that feel more runway than resort gift shop. I particularly love the bold, playful pieces from Julietta, above, and the under $300 price range. Also cute and affordable: the Anni Lu, below, this Chan Luu, and this Isabel Marant.