You are looking at a chrysoprase skull pendant.

Bright translucent green chalcedony. Uplifts heart Chakra. Greater flexibility, wisdom, generosity, self-confidence. Heals depression, excess self-focus, emotions/sexual imbalance. Placed on heart, neck, or on brown for meditation. This quartz stone found in the USSR , Brazil , Australia , and US. A bright green crystal similar in color to green apples. Helps one achieve greater personal insight, feel more clam, become less egotistical, and more open to new surroundings and situations. Stimulates creativity and draws out unknown talents. Enhances fertility for both sexes. Helps guard against sexually transmitted diseases.