Quartz crystal is crystallized silicon dioxide (SiO2). Quartz crystals are quite hard, around 7 on the Mohs scale, just under diamond which, along with concerns such as silicate dust makes these crystals challenging to cut. Most quartz crystals are small in size with pyramidal ends. Often one end is broken off from a cluster leaving ragged edges and in order to use the crystals in jewelry those edges need to be cut. This can be done with good protection and the right tools
Wear protective clothing and safety equipment and ventilate your work space. Insert the quartz crystal into your vise so that the area you wish to cut is accessible on the end closest to you (if possible) and with the leather between the metal of the vise and the stone. The stone should be firmly held, but not so tightly as to crush it. Insert the quartz
Holding your Dremel tool firmly, allow the diamond blade to contact the crystal. Don't push the blade. Allow the blade to work for you. Lift the blade often to keep it from overheating. Add oil as needed.
F.R.R. Mallory has been published since 1996, writing books, short stories, articles and essays. She has worked as an architect, restored cars, designed clothing, renovated homes and makes crafts. She is a graduate of the University of California at Berkeley with bachelor's degrees in psychology and English. Her fiction short story "Black Ice" recently won a National Space Society contest.