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Hi Belle,
Black tourmaline is a grounding and protective stone. It may help if you are sensitive to others' energies, but I'm not so sure if it will help calm your own nerves. One stone that has helped me calm my nerves and help me speak clearly is sugilite. Although this isn't normally a stone used for this purpose either, at least according to the books, it is a protective and purifying stone so it may help clear your own negativity. I've found it useful during phone interviews when I can hold it stone in my hand.
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