Sample. One only.
This is a tester for sapphires only, but not gemstones!
It is for detecting 'watch glasses' that are made of sapphire instead of glass.
Sure, it works, but would someone explain to me why you would want to know if a 'watch glass' is made of sapphire.
My only guess is that it helps detect forgeries, since the sapphire 'glass' alone wold cost more than any fake watch.
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