Her letter also magnified the pressure the BBC has recently faced internally and externally to fix a significant pay gap between men and women throughout its ranks, even among its top television and radio stars.
The BBC did not respond to a request for comment on Sunday night but in a statement to BBC News, a spokeswoman, citing a salary audit, said there was “no systemic discrimination against women” and that “a significant number of organizations have now published their gender pay figures showing that we are performing considerably better.”
Last year, the publicly funded network published the salary ranges of employees who earned more than £150,000, or about $204,000, annually — a list that was two-thirds men and included no women among its seven highest earners. Ms. Gracie did not make the list. On average, men made about 10 percent more than women, the report found.
Ms. Gracie said she learned in that report just how severely she had been underpaid despite her high-ranking position in its news division. While she did not reveal her salary, she said that of the four international news editors, the two men earned 50 percent more than the two women.
She wrote that she believed her promotion to China editor, which required her to move to Beijing and leave her children in the United Kingdom, meant she would be paid the same as her male colleagues.
“Like many other BBC women, I had long suspected that I was routinely paid less, and at this point in my career, I was determined not to let it happen again,” she wrote about accepting the China editor position in 2014. “Believing that I had secured pay parity with men in equivalent roles, I set off for Beijing.”
Ms. Gracie said that after the salaries were made public, she asked for pay matching her male counterparts’. BBC management offered her a “big pay rise which remained far short of equality,” so she declined it, she wrote.
“Since turning down an unequal pay rise, I have been subjected to a dismayingly incompetent and undermining grievance process which still has no outcome,” she added.
Ms. Gracie, who could not be reached on Sunday night, previously worked as a presenter on the BBC.
While she has quit her job in China, Ms. Gracie said she will return to a former position within the newsroom “where I expect to be paid equally,” she wrote.