We sell a heap of these Black Tourmaline pendants in pencil or tube style as the price is great and the effectiveness is marvelous. We sell many to guys and not just ladies. This style (and we have it in heaps of different crystals e.g. scolecite, selenite, carnelian, amethyst, moonstone, lepidolite, clear quartz etc) is silver-coloured metal on a base metal probably brass. There is no nickel.
Tourmaline of any colour helps keep out unconscious connection to other people’s energies. However, I found it restoring my energy and then my happiness whenever I am feeling unusually “down” at the shop.
When you buy a black tourmaline pendant is best worn at or between the Heart or Solar Plexus (the two most sensitive energy areas). You will probably find it too strong to be worn for long at the throat or thymus. I have sold hundreds of these and never had anyone not impressed by their help.