The most common crystal question I get asked is “what’s the best crystal(s) for protection?”.
Now what does that mean, exactly? In a nutshell, people usually mean that they’re looking for a crystal that can prevent them from being negatively affected by unwanted energy or influences.
It could be other peoples’ stress or emotional energy; ill-wishing, cursing, or psychic attack; envy, fixation, or jealousy; sorcery; malevolent spirits or spirit attachments; manipulation or abuse; a run of bad luck or ill fortune; or even the bad vibes of a room, house, building, plot of land, etc.
There’s generally a list of crystals I can suggest, but the truth of my experience is that not all protective crystals work the same — what you work with very much depends on what’s affecting you and what you need.