Before wearing a crystal necklace to ward off colds and other problems, old folks in my youth wore garlic clove necklaces all winter. Such beliefs are always with us, causing a lot of curiosity. The people I've dealt with looking for a one-of-a-kind personal crystal are generally young and healthy, have taken all that to the metaphysical/spiritual realm, hoping the sparkler will focus visions. Notice none asked for prayer here.
I dug the crystals for years, soaked them in acid to remove impurities, ground off imperfections, drilled holes or attached settings for necklaces and other jewlery, and helped folks look for their perfect find at the tables. Sometimes the customers would engage in a conversation with one, then buy it at list price, or buy boxes of them for their club. Eventually I realized I was enabling a cult religion, so quit that pursuit. Unfortuantely thousands of my crystals probably hang around necks, wrists, and on rings and ear rings for reasons other than their natural beauty.