Whenever you get unsatisfactory results, the first thing to do is inspect the peak of the Au. In case the peak is not fixed at 0, you must perfume an initialization to re-adjust it to 0. Proceed to check where your gold sample is positioned in the machine. Ensure it is placed in the appropriate place on the testing window. Also, check to make sure your jewelry sample is well-proportioned. If the surface of your sample is not flattened and homogenous, then you’ll need to polish it.