Our crystals are all cleansed with sage before shipping. This is the method we recommend for cleansing because it is safe for all types of crystals. Sound cleansing is also a great and safe method for all stones. My cats don't like the noises and they're the boss so that is why we use strictly sage.
You can cleanse hard stones like quartz with water but that can ruin softer stones so always do your research before choosing how to cleanse if you are using water.
We don't recommend sunlight because it can bleach the color out of a lot of crystals over time.