Not every agreement with a big-name company is a gem—a lesson South Florida jewelry stores claim they learned the hard way.

A group of jewelry companies filed an $18 million countersuit against Swiss watchmaker Ulysse Nardin after the company accused them of not paying their bills. Ulysse Nardin is owned by Kering, a publicly-traded Parisian company that boasts annual revenues of nearly $15 billion and a portfolio that includes Gucci, Yves Saint Laurent and Balenciaga.