You are looking at a Citrine skull pendant.

Citrine is one of a very few stones that does not hold on to or accumulate negative energy, but dissipates and transmutes it., working out problems on both the physical and subtle levels. It hence, never needs clearing or cleansing.... the merchants stone; placing a cluster or crystal of citrine in ones cash box has produced more income for the merchant. It not only assists the merchant in acquiring wealth, but helps to maintain a state of wealth. It activates, opens and energizes the navel and solar plexus chakras directing via personal power creativity, and intelligent decisiveness, the energy necessary to enhance the physical body. It stimulates both mental focus and endurance.