Quality Assurance Benchmarks highlight workmanship of semi-finished and finished jewellery. Learn how to remove oxidation from an assembled ring made from platinum cobalt components with these helpful illustrations and instructional video.
These benchmarks relate to the removal of oxidation. This oxidation occurred during the soldering process when assembling the platinum cobalt setting and mounting.
After the removal of oxidation, there should be no discoloured or darkened areas.
There are no tool marks or other evidence of mechanical removal.
The finish where the oxidation was removed is even and smooth.
Potential Problems and Engineering Features
Oxidation that occurs on platinum cobalt is dark, spotty, and covers certain areas on the piece, depending on the soldering situation. For best results when removing oxidation, firecoat the piece, mildly heat and then pickle.
Here, the setting was soldered into the ring mounting and the resulting oxidation is random.
Mechanical removal of oxidation is another option, but it is time consuming, reduces the metal's dimensions, and would be difficult given the limited accessibility to the areas where it would be concentrated.