Kaiden Singh, who has worn his Sikh religious bangle since birth, was asked to remove it after he started at his new school, Summerhill Primary School in Tipton, in the West Midlands region last month.
His father, self-employed businessman Sunnie Singh is fighting the ban on the grounds of discrimination.
"I was totally gobsmacked and completely shocked. It is a religious symbol and a religious principle. We wear it for religious reasons, it's not to give a statement or for fashion," Singh said.
"The school have threatened my son and said he'll be excluded if he continues to wear his bangle. They shouldn't do that to a child. They're trying to class it as a jewellery but it's not, it means a thousand words to us. It's racist and in my mind discrimination," he said.
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The family is currently taking up the matter through the schools official complaints procedure.
Meanwhile, Sikh Federation UK has highlighted a similar case dating back to 2008 as a precedent for the school to follow.
But Summerhill Primary School has claimed that it has offered to discuss the matter with the parents.
Headteacher Kerry Rochester said: Our school uniform policy does state no jewellery, only ear studs if a child has pierced ears. All parents are made aware of this when they send their children to our school.
The kara is part of the five key symbols of the Sikh faith, which also include kesh,kanga, kachha and kirpan.
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