How to Use Adventurine:

Using it as Jewelry
Aventurine's lovely, glittering green color makes it a great stone for jewelry. However, wearing it as jewelry can have some "bonus" effects in addition to its aesthetic value.
Aventurine jewelry is best worn over the heart chakra. either on a long pendant, a brooch or pin, or both.
This will keep the heart chakra's energy flowing freely, avoiding blockages and sluggishness.

Using it at your house
Aventurine can be a very helpful stone if you're experiencing SAD or the "winter blues" because of its strong connection to spring.

Aventurine should be placed close to a window, an incandescent light, or a fireplace or other source of heat or light. The energy of renewal and serenity that this stone possesses will touch you when you are drawn to that light or heat source to escape the cold.
After all, the sense of earthiness and sunshine that it evokes is the source of many of its deepest meanings.