BOSTON ( TheStreet) -- Here are four ratings changes from TheStreet's stock model.4. The model downgraded jewelry seller Tiffany & Co. ( TIF) to "hold." The company is scheduled to report fiscal fourth-quarter results March 22. The numbers: Fiscal third-quarter profit inched down 1% to $43 million, or 34 cents a share, as revenue declined 2.9% to $598 million. The operating margin tightened from 13% to 12%. Tiffany & Co. holds $375 million of cash and $753 million of debt. The stock: Tiffany & Co. has soared 160% over the past year, outpacing major U.S. indices. The stock trades at a price-to-projected-earnings ratio of 19, a premium to peers. A PEG ratio of 1.9 indicates that shares are expensive based on growth expectations. A PEG ratio over 1 implies costly shares. 3. The model downgraded drug maker Warner Chilcott ( WCRX) to "hold." The numbers: Warner Chilcott's fourth-quarter loss narrowed to $9.5 million, or 4 cents a share, from $116 million, or 46 cents, a year earlier. Revenue nearly tripled to $686 million. Warner Chilcott's operating margin narrowed from 29% to 20%. Its balance sheet contains $539 million of cash and $3 billion of debt. The stock: Warner Chilcott has advanced 159% in the past 12 months, beating major benchmarks. The stock sells for a price-to-projected-earnings ratio of 8.1, a discount to the industry average of 11. The shares are expensive based on sales and cash flow.