Everything has an electromagnetic field. Electromagnetism is what holds atoms together. Your body has electromagnetism and gemstones also have electromagnetism. My tens unit can find my acupuncture points and my chakras. After I open a chakra, the pitch of the sensor on my tens unit goes up considerably. A recent scientific theory supporting the millenniums old belief in the healing powers of crystals and gemstones suggests that the electromagnetic fields of stones and crystal interact the electromagnetic fields in our bodies. Each type of gemstone, mineral and crystal growth form produces a unique electromagnet field, thus each affecting our bodies in different ways. The healing and metaphysical properties I list on my blog or etsy store are compiled from various cultures and sources and many of the properties are similar throughout several cultures.
My favorite site dedicated to handmade items is www.etsy.com. I recommend browsing through the subcategories on etsy. You can type in keywords (like “smoky quartz” or “black tourmaline”) in the search field on top, and then narrow your search in the categories on the left. You will be able to view items fitting your criteria made by a large pool of artists from all over the world. You can even sort your results by price. My own personal etsy store is http://www.etsy.com/shop/DoodlepunkArt
For more information on electromagnetic fields, go to thinkquest.org or http://www.reiki.org/reikinews/sciencemeasures.htm An excellent document on the history of electromagnetic field awareness throughout various cultures is available at http://twm.co.nz/energ.html