Tiffany and Co. plans to close Iridesse, the 16-store pearl-only chain it launched in 2004. The closings will occur "as we make agreements with the landlords and sell off the inventory," said company spokeswoman Linda Buckley. She expects that to happen over the next few months. "We still very much believe in the concept, but the current economic climate being what it is, the Iridesse business was disappointing," Buckley added. "We believe it has potential, but we just couldn't continue to support it at this time."