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THE PLAYERS Championship - Preview Day 3
Tiffany & Co. boxes pictured at THE PLAYERS Championship on May 10, 2017, in Ponte Vedra Beach.
Ryan Young—US PGA TOUR/Getty Images

Costco owes Tiffany & Co. more than $19 million after selling generic diamond rings falsely advertised as "Tiffany" rings, a judge ruled Monday.

Costco made $3.7 million selling 2,500 diamond rings falsely identified as "Tiffany," the Washington Post reported, citing a 2015 verdict. Costco argued that the diamond rings had a pronged setting known as "Tiffany," but the jewelry company argued the store's use of the stand-alone name without any modifiers was misleading to customers.

U.S. District Judge of the Southern District of New York Laura Taylor Swain ruled Monday that Costco should pay Tiffany $11.1 million to make up for lost profits and $8.25 million in legal damages, the Post reported.

“Judge Swain’s decision validates the strength of the Tiffany trademark and the value of our brand, and most importantly, sends a clear and powerful message to Costco and others who infringe the Tiffany mark,” Tiffany & Co. said in a statement to the New York Times.

Costco said it plans to appeal the ruling.

"From a purchaser list of approximately 2,500, Tiffany identified fewer than 10 who said that they had misunderstood Costco’s signage," Costco said in a statement. "This was not a case about counterfeiting in the common understanding of that word – Costco was not selling imitation Tiffany & Co. rings."