A natural clear quartz 47mm x 27mm crystal on a 22" sterling silver link chain necklace.

Quartz Crystal - 

Clear Quartz Crystal is one of the most versatile stones available. This stone possesses the three key properties of programmability, amplification of intentions and cleansing one's energy field which makes it a multidimensional and powerful stone to have. When one focuses intentions clear Quartz Crystal can be programmed towards these intentions to help achieve any inner or outer goals one sets. A great clarifying stone, it brings clarity to thoughts and a sense of purpose which helps overcome confusion when one is seeking out the answer to personal questions by establishing a strong, clear connection to higher guidance. 

Found in Brazil and the United States.