Crystal Enchantments: A Complete Guide to Stones and Their Magical Properties
Written by D.J. Conway 

You don't have to have extensive background in magic to make use of any stone. In fact, you don't have to know about magic at all. If you are facing a difficult situation and feel you need protection and courage, wear garnets. Do you want to attract a lover? Use rose quartz or ruby. Are you troubled by negative vibrations? Wear, carry, or keep near you black onyx or obsidian.