What breed is my cat with black paws, black mouth, and black eye rims?

From the cat’s features it is a Chinchilla or Chinchilla mix; purebred status needs genetic and bloodline proof, not just looks. The Chinchilla is a bred specialty cat, silver-white overall with pure white undercoat and black tips on back, belly, head, and tail.

Its trademark is the eyes, lips, and nose with black pigment like eyeliner, round full eyes, and green or blue-green pupils. Repeated disordered breeding can make genes and looks unstable, so the look may not be perfect, but purebred is not the only measure of a good cat.