Black Tourmaline is a very helpful crystal for pets (as well as humans) when dealing with a lot of tension, stress and negative energy situations.  It has a very grounding effect and also works to block that which is causing emotional turmoil.  
 
This one of a kind crystal measures over 1/2 inches across and over 3/4 inches in length.  It is a stunning gemstone that has natural nooks and crannies as well as reflective surfaces that feel polished and smooth.   I have handcrafted this charm using silver Artisan wire that has a copper inner core. Over time and exposure to moisture, you will see the lovely copper patina showing through. It is suggested you try to wipe the crystal pendant dry if you notice it is wet.
 
We've done a lot of field testing with our Pet healing crystal line and when you combine the crystal sitting next to metal ID charms and you have a very active pet? The crystal can be damaged due to the banging against the other parts of the collar.  I would suggest careful placement.  This is a gorgeous and beautiful way to decorate your pet's collar with gemstone jewelry as well as for healing properties. 
 
The crystal will come ready to attach to your pet's collar with a strong metal ring. The purple collar in the photos is an example only to show you what it would look like and is not included