If your ex becomes the richest person in the world, keeping his possessions could turn advantageous in the future.

The ex-girlfriend of tech mogul Elon Musk is auctioning off a collection of pictures and other memorabilia from their relationship. The souvenirs are being sold by Musk’s college flame Jennifer Gwynne via the Boston-based RR Auction, reports CNN.

According to a press release RR Auction provided to CNN, Gwynne and Musk began dating in 1994 while they were both employed as resident counsellors in a university dormitory. Musk began a doctoral study at Stanford soon after graduating from the University of Pennsylvania, but left to found his first firm, Zip2.

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The collection includes souvenirs from Musk and Gwynne’s time together in addition to 18 candid pictures of the businessman when he was a baby-faced University of Pennsylvania economics student.

Before his quick ascent to fame, the billionaire appeared just like any other college student in the glossy images, hanging out with his fellow resident advisers, having fun in his dorm room, and cuddling with his fiancée.

A birthday necklace given to Gwynne on her birthday is the item with the current highest bid, followed by a signed birthday card, the CNN report adds.

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The message reads, “Happy Birthday, Jennifer (aka Boo-Boo), Love, Elon.” Sunday morning's opening bid is almost $7,000, which is the most. According to RR, the card is anticipated to sell for more than $10,000.

The emerald in the gold necklace was mined in Zambia by Musk’s father Errol, a successful South African engineer and real estate entrepreneur.

Two photographs are also included with the necklace: one of Musk and Gwynne with the former’s mother, the model Maye Musk, and the other of them at a 1995 end-of-the-year formal.

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Tesla aficionados have until Wednesday, when the auction closes, to place a bid on a piece of Elon Musk memorabilia.