A Manhattan high-school guidance counselor under investigation for an alleged sexual relationship with a student was fired after the girl was seen wearing a gold ring he had bought.

Jeremiah Mimms, 31, who counseled kids at Global Learning Collaborative on the Upper West Side, denied the girl’s account that they kissed and touched each other sexually in Central Park. He claimed he gave her “bicycle lessons.”

The smitten girl also told probers she visited the married Mimms’ home several times to watch TV in his living room, says a report by the Special Commissioner of Investigation.

“He really cares about helping his students achieve their full patentual (sic),” she wrote in a statement.

The girl later retracted her confession after learning that Mimms could lose his job, SCI reports.

But a co-worker gave incriminating evidence, testifying that Mimms once showed her a 14-carat gold ring and asked if she liked it, SCI reports. Mimms explained the ring was for “a friend,” not his wife — who “preferred 24-carat gold.”

Months later, the colleague spotted the girl believed to be involved with Mimms wearing the same ring. She had “no doubt” it was the one Mimms had shown her.

Mimms, who did not have tenure, was fired last April, said a spokesman for the city Department of Education. Mimms did not return messages.