You are looking at a Citrine skull. The skull is 3.3 inches from top to bottom.

This stone is very versatile and is used for mental and emotional clarity, problem solving, memory issues, will power, optimism, confidence and self-discipline. It reduces anxiety, fear and depression. Citrine is one of two crystals which never have to be cleansed of negative energy. An energizing and highly beneficial crystal, citrine absorbs, transmutes, grounds and dissolves negative energy, which makes it a very protective stone. Citrine crystals are invigorating and positive. They can surround and fill anyone with its brilliant color, energizing every aspect of life. Increases motivation and Persons involved with education or business will especially benefit. Can guide you to harness and utilize your creative energy. Helps us analyze events and steer them in a positive direction. Develops inner calm and security, and makes us less sensitive and more open to constructive criticism. Can dispel negative feelings and help us to accept the flow of events. This stone is great with help in achieving goals. Because of its matrix of iron and quartz, it is most effective on the Sacral/Sexual/Navel Chakra, the Solar plexus Chakra and Crown Chakra. The grounding abilities of citrine help to alleviate anxiety, as the more orange encourages creative flow and sexual arousal, where the more yellow citrine has a soothing affect on the digestive system. Citrine energizes every level of the aura, cleansing and balancing the subtle bodies as it aligns it with the physical body. Citrine is the stone of abundance. It teaches us the lessons of achieving wealth and prosperity. Not just on a monetary level, but in all aspects of our lives.