Drew Brees climbed into the witness stand in a San Diego courtroom on Thursday afternoon and recounted how, as he sees it, a jeweler exploited their friendship to sell the New Orleans Saints' quarterback extremely overpriced diamonds.

He spoke on the first day of testimony and arguments in a civil trial pitting Brees against La Jolla, California, jeweler Vahid Moradi and his company, CJ Charles Jewelers.

Brees missed offseason workouts at the Saints’ training facility in Metairie this week to deliver his perspective on his dealings with Moradi — sworn statements that are crucial to his quest to recover millions of dollars that he and his wife, Brittany, claim the jeweler owes them.

Brees explained how Moradi and CJ Charles Jewelers sold the couple $15 million worth of diamonds — one of which was a ring costing more than $8 million — between 2012 and 2016.

Brees — who began his NFL career in San Diego when the Chargers played there and still maintains a home there — on Thursday said he became friends with Moradi over the course of about 15 years. He trusted the jeweler so completely that he invested roughly $350,000 in a software company recommended to him by Moradi and considered investing in another store with him, according to Jeff McAdam, a reporter for San Diego’s Fox television news affiliate.