What are you trying to do? Are you talking about prospecting for diamonds or just trying to find a lost gem? If so, how valuable is it? There are ways. I know many people have been fed bad info about Long Range Locators, but the LRL's can be used to help find a lost diamond. Problem is once you have a suspected area where it is (usually within a couple feet), you will probably need to sift the ground, wash it, and pan it. It will take a lot of time to learn LRL's, unless you know someone who knows. So if it is a $100 value, forget it.
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Yes, of course. I myself would try this.