"Note @oprah sent to my asst this am 'plz tell Gayle I'm on treadmill & it's hard to focus w/the circus around your neck,'" King wrote alongside an image of the necklace in question. "I think she's WRONG thoughts?"
While it's hard to imagine any friendship surviving that kind of shade, it's something the famous friends have been through before.
King also took to Instagram last year to vent about Winfrey's critique of her lip color.
"@Oprah just called & said tell your makeup artist waaaay too red on the lips today," she captioned a snap of her on-camera look. "I said proudly 'I did that MYSELF' Dead silence on the line ... Hello ??hello?..."