The 18 karat Agrafe Herringbone twisted necklace was made by Cartier in the 1980s, and although it’s no longer produced by the luxury brand  it retails for the steep price of $27,350, as per recent resale on 1stDibs, an online luxury marketplace,

Taylor Swift has become a regular fixture at NFL games since dating Kansas City Chiefs star Travis Kelce

The 18 karat Agrafe Herringbone twisted necklace was made by Cartier in the 1980s, and although is no longer produced by the luxury brand

At that price, the necklace is worth almost half the average American salary, which according to Forbes is $59,428 annually – and in Wisconsin is just $56,120.

Swift first stepped out wearing the vintage piece in May this year,

The sparkling gold accessory was easy to spot on Swift’s stylish black ensemble and knee-high boots and her signature red lip.

Over the top, she wore a bright red Stella McCartney teddy coat – which some fans were convinced she borrowed from Brittany Mahomes, the wife of the Chief’s quarterback Patrick Mahomes.

However a source told Page Six the red outerwear belonged to Swift.

Sadly, the gorgeous diamond heavy-necklace and big red coat didn’t help the Chiefs, who lost their fourth game of the season to the Green Bay Packers, 27-19.

The Cruel Summer singer began supporting Kelce at his games in September and has been snapped numerous times at games every since.

Kelce  talked about attending Swift’s Eras Tour concert on his New Heights podcast in July,  and reflected on his failed attempt to give the international superstar his number.

The singer wore a bright red Stella McCartney teddy coat – which some fans were convinced she borrowed from Brittany Mahomes, the wife of the Chief’s quarterback Patrick Mahomes

Brittany Mohomes (pictured) has also been spotted wearing the coat to Chiefs games before Swift wore it

Swift was first  spotted wearing the vintage diamon-encrusted 18K gold Cartier necklace in May

The couple first stepped out together in September, after Swift attended a Chiefs game

However, it appears their romance was meant to be, with the sports star stating, ‘There were definitely people she knew that knew who I was, in her corner [who said]: “Yo! Did you know he was coming?” I had somebody playing Cupid.’

The Bad Blood hitmaker soon reached out to Kelce, and the Chiefs star expressed, ‘She told me exactly what was going on and how I got lucky enough to get her to reach out.’

‘When I met her in New York, we had already kind of been talking, so I knew we could have a nice dinner and, like, a conversation, and what goes from there will go from there.’

He then admitted, ‘Everybody around me telling me: Don’t f**k this up! And me sitting here saying: Yeah – got it.’

Earlier last week, the pro football player opened up about his whirlwind romance with Swift during an interview with the Wall Street Journal.

‘I’ve never been a man of words,’ Kelce expressed to the outlet, and gushed, ‘Being around her, seeing how smart Taylor is, has been f***ing mind-blowing. I’m learning every day.

Last week, a moving truck was seen outside of the NFL player’s $6 million Missouri mansion as the singer moved into the sprawling home.

A source recently told DailyMail.com, ‘While Taylor is not officially moving in with Travis, her friends and family believe she isn’t exactly moving out either.’

‘Everyone truly believes that Taylor and Travis are soulmates. Taylor also believes this, as does Travis.