Cartier sued Tiffany, claiming its competitor in the luxury jewelry space stole trade secrets about some of its most exclusive products from an employee it hired away.

Cartier, a division of Richemont North America, sued Tiffany and Megan Marino, a former “junior manager” at Cartier in New York State Court. According to the suit, Tiffany, which was acquired last year by LVMH Mo√ęt Hennessy Louis Vuitton SE, hired Marino to work on its “high jewelry” collection, which includes individually made pieces that range as high as $10 million in price.

Marino passed confidential information about Cartier’s own high jewelry business to her new colleagues, the suit alleges. Cartier claims its investigation into the case has “opened a window into Tiffany’s disturbing culture of misappropriating competitive information.”