A man advertises for a jewelry store that buys gold in Manhattan in New York City.

Here's another sign that investors are getting tetchy about the performance of precious metals such as gold.

According to Bank of America Merrill Lynch's weekly flows report, investors yanked $1 billion from precious metals funds in the week to Nov. 25, the chunkiest outflow in 17 weeks. Data this week were based on four days of fund flows as opposed to the normal five due to Thanksgiving holiday, the bank said.