Lewis Hamilton warned Formula One risks taking "a step backwards" if governing body FIA continues to impose "unnecessary" jewellery regulations on drivers.
New race director Niels Wittich, who replaced Michael Masi at the start of the season, reminded drivers at the Australian Grand Prix in early April that the FIA's code prohibits drivers wearing jewellery in the car.
Hamilton still competed in Melbourne with piercings in both ears and a nose stud, and Wittich has reiterated the rulings ahead of the inaugural Miami Grand Prix this weekend.
Wittich explained that wearing jewellery under flameproof clothing can reduce protection and increase the risk of burn damage, but Hamilton remains staunch in his refusal to conform to the FIA's demands.
"I couldn't get any more jewellery on today," the Mercedes star told reporters on Friday.
"But I don't really have a lot more to add than what I already said the last time I was in front of you guys and we spoke about it.
"I feel it's almost like a step backwards. If you think of the steps we're taking as a sport and the more important issues and causes that we need to be focused on and really pushing.
"I think we've made such great strides as a sport. Look, we're here in Miami. This is such a small thing – I've been in the sport for 16 years, I've been wearing jewellery for 16 years.
"In the car I only ever have my earrings on and my nose ring, which I can't even remove. So it seems unnecessary for us to get into this spat."
The jewellery ban has been in place since 2004, but Wittich made a special effort to stress the rule in his pre-race notes in Melbourne before reaffirming his demands in the United States.
Hamilton also revealed he has reached out to FIA president Mohammed Ben Sulayem, although he is yet to get through, to try to find a resolution and encourage greater attention on more important matters.
"I am willing to sign a waiver to take the responsibility away from them if necessary," the seven-time world champion added. "It is about individuality and being who you are.
"I did try calling Mohammed this morning and I think he was super busy but I sent him a message. I wanted to reassure him and said: 'I want to be an ally. I don't want to fight with you guys over this.'
"It has never been a safety issue in the past. If they stop me, we have a spare driver. There are lots of things to do here."
AlphaTauri driver Pierre Gasly was quick to back Hamilton.
"I do believe there are bigger things to focus on," Gasly said. "I appreciate the FIA are looking after our safety.
"But in my case I am religious and there are things I have with me that I do not feel comfortable not having in the car.
"In the end, we are the ones who go out there and put our lives at risk and I do feel it should be a personal choice. I hope in the end we could find a better solution than this very strict one."
Hamilton lauds 'quite incredible' Ferrari form ahead of 2025 move
Lewis Hamilton said watching Ferrari and McLaren overhaul Red Bull in the Constructors' Championship has been "quite incredible" ahead of his move to the Italian team.
Red Bull appeared to be set for another dominant year on track after Max Verstappen won seven of the first 10 races, with team-mate Sergio Perez also securing four podiums.
However, Red Bull endured a mid-season struggle, with Verstappen failing to win in 10 races before his stunning wet-weather display at the Brazilian Grand Prix last time out.
The Dutchman is on the cusp of a fourth world championship after title rival Lando Norris could only manage sixth in Interlagos, leaving him 62 points behind in the standings.
But going into the final three races of the season, Red Bull find themselves third in the constructors' championship, 44 points behind leaders McLaren and 13 adrift of Ferrari.
Before Verstappen's victory in Brazil, Ferrari had claimed back-to-back victories in the United States and Mexico.
Charles Leclerc, Hamilton's team-mate for the Scuderia next season, won in Austin to emerge victorious for the eighth time in the competition.
That triumph was then followed up by a win at the Autrodromo Hermanos Rodriguez by Carlos Sainz, who will make way for Hamilton and join Williams next season.
And Ferrari's recent displays on track have Hamilton excited about the potential of challenging for an eighth world championship next season.
"I'm very interested in my future, of course," said Hamilton. "And so, in that respect, keeping an eye, yeah. Watching everything that happens."
"If you look at somewhere like maybe China already, the Red Bull was like a second ahead.
"And it's been quite incredible to see the McLaren rise and then the Ferrari in the last few races, to see their progress and just trying to keep an eye on everyone's car and what they're changing and what they're adding.
"You know, we all watch the video, all the drivers, we all watch the onboard laps and we're always trying to see where we can gain time.
"And there's some cars that just react differently and better or worse in certain areas.
"And you're trying to figure out how you can find that within either your balance or get the team to develop the car in that direction."
Hamilton could 'take a holiday' after Sao Paulo disappointment
Lewis Hamilton says he "could happily go and take a holiday" instead of finishing the season after a dismal showing at the Sao Paulo Grand Prix.
He made early exits in both qualifying sessions and started the race at Interlagos from 15th on the grid.
However, unlike Max Verstappen, who impressively won the race having started in 17th, the Brit struggled to mount much of a fight, coming away from the weekend with just one point after finishing in 10th.
His performance was made to look worse as team-mate George Russell had been battling for the lead but narrowly missed out on a podium place as he finished fourth.
Hamilton only has three races left with Mercedes before his move to Ferrari next season, bringing an end to their 12-year partnership.
But he was left frustrated in Brazil, expressing his disappointment with the car.
"We were just slow," Hamilton told Sky Sports F1. "The car was really, really tough. I do really want to say still a big thank you to the guys in the garage. They turned up super early this morning and still did a great job throughout the weekend.
"The team could have won also, so at least one car was behaving a lot better.
"The car is like a plank of wood. It's like no suspension.
"It's bouncing on the tyres everywhere, and you can't get on the power anywhere. It's just the worst ride, I think the worst ride that we've definitely ever had, particularly through corners. It's just so stiff.
"But hopefully we won't have any more bumpy tracks. I think the last three aren't so bumpy. But yeah, I could happily go and take a holiday."
Norris claims Verstappen 'got lucky' in Brazil as title hopes fade
Lando Norris said Max Verstappen benefitted from a rule "no one agrees with" as he won a dramatic Sao Paulo Grand Prix to leave the McLaren's title hopes hanging by a thread.
Verstappen surged to a terrific victory from 17th on the grid in Brazil, with Norris faltering after starting on pole.
Norris and Mercedes' George Russell – who were vying for the lead – both pitted on lap 29, but that strategy backfired as the red flag was shown following a crash involving Franco Colapinto.
With the race suspended, Verstappen was also able to change tires for the restart, negating Norris' advantage from pitting as the world champion raced to a commanding victory.
Norris had cut Verstappen's drivers' championship lead to 44 points by winning Saturday's sprint race but now sits 62 points adrift with just three races of the season remaining.
The Brit refused to hit out at McLaren's strategy after the race, though, putting his struggles down to bad luck.
"I have faith in the team in what they are saying and they have trust in me," he told Sky Sports F1.
"It was just unlucky. I don't care about the hindsight side of things, that's luck for them, nothing more.
"They got lucky on a rule that no one agrees with. Probably they agreed with it today but every driver has disagreed with it in the past.
"Today it benefitted them, it could have benefitted us if we just stayed out, but that's a stupid thing to think of.
"Just a bit unlucky today, nothing more. Of course, disappointing. Max drove well. He got a bit lucky but that's life."
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