Steel seal is the mark printed on the metal surface during jewelry making. When polishing diamond rings, abrasive materials, liquids, grinders and other equipment are usually used to remove defects and wear on the surface of diamond rings. The steel seal is generally on the inside or side of the diamond ring, which will not affect the appearance or quality of the diamond ring. If the steel seal is worn or damaged and needs maintenance, you can find a professional jewelry repair shop to deal with it. But polishing will not affect the existence of steel seal, because it is engraved on the metal itself, not on a specific coating.