Get the best prices on diamonds, engagement rings, wedding bands, charms, watches, gemstone and gold. A cultured pearl necklace, Tiffany & Company Natural Pearl Necklaces Realize Up to Ten Times Pre-sale Estimates at Leslie. Classic set of pearls from Tiffany & Co. that we trust. Fortunately, the quality of our pearls is higher than that of Tiffany's. Lovely light grey/purple tone freshwater pearls with an 18k white gold double-sided clasp.