Traditionally, the perfectly round, white saltwater pearls from oysters have been prized above small, irregularly shaped, and strangely colored freshwater pearls from mussels. By 2002, scientists in China (where 99% of freshwater pearls originate) had perfected a means of creating bigger, rounder, and whiter freshwater pearls. These superior mussel pearls now sell well at Tiffany's and other prestigious jewelry stores (though at slightly lower prices than saltwater pearls). What is the likely effect of this innovation on the cross-elasticity of demand for saltwater pearls given a change in the price of freshwater pearls?