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Likely 10 X would be enough; and practical. Higher magnification is difficult to hand hold steady enough , so certainly at 30 X you are talking about expensive equipment that is mounted on a stand : Typically a zoom binocular going from 10 to 40 X. Also light becomes critical. You can carry a 10 X loop in your pocket and they are the standard for looking ...


3

It should be possible to calculate this, but note that it will depend on your eyesight as well, and the contrast you can get (directional lighting may help) If you look at how many characters there are in a typical inscription (I've seen up to about 30 for synthetic diamonds online;this is lovely to be a worst case), and how much space they fit in, you can ...


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