Citrine is a variety of quartz, with color ranging from yellow to gold to orange brown shades of transparent quartz. It's a great stone to use to get rid of negative energy. Oddly, when used in this fashion, Citrine never requires cleansing or clearing. The warm energy it emits promotes optimism. For hundreds of years, merchants have placed a small citrine stone into the cash register or around where business is conducted. This is done not only to acquire wealth, but the presence of the citrine is thought to help maintain the wealth as well.