The difference is mainly that polishing is more thorough by comparison, not to mention expensive, and leaves your
ring looking new. When you first send it in, the goldsmith makes use of a polishing wheel to buff it out. This involves getting out any obvious scratches, although that is not recommended more than twice because each time, it removes a tiny amount of metal from the surface.
Jewelry cleaning, on the other hand, is meant to clear any grease or dirt that has
been deposited on the ring from natural skin oils or lotions. You would not believe how much of each a
diamond can attract when worn on a finger. A professional cleaning involves putting the ring in a powerful ultrasonic cleaner capable of shaking off the unwanted particles through induced vibration. This also prevents the metal from taking on scratches, which means it can be done twice yearly for best results.