Crystal:

Crystals fall in to two categories: Quartz crystals, which have always been considered to have great powers -- for example, quartz crystal earrings which assist in balancing the left and right sides of the brain with respect to the energy of the crystalline form contained in the jewelry. The second type are the Swarofsky, made in Austria. Swarofsky is the manufacturer of note. There is one problem with crystal about which one should be aware. Since crystal is leaded glass, the cuts are very sharp. Every year or so a crystal necklace should be checked to make sure the stringing material is not fraying.