Beware of Disney cruise line jewelery

Purchased this necklace on the Wish 2 years ago and wore it on and off until about 2 months ago where I’ve been wearing it everyday and I noticed today that the black was coming off from the Minnie ears. I was told the black was onyx but it actually looks like paste? It was shiny like onyx before but now it looks matte so I’m guessing the coating came off.