Frame Material: oxidized 925 Sterling Silver.
Shape: round shape
Measurement: Stone is 18mm, the connector is 29mm with both rings, and 22mm with frame.
These stones are known as hydrothermal quartz, which contains the same physical, chemical and optical properties of natural stone. For further information and details regarding this process, see the AZ Findings Blog: http://www.azfindings.com/blog.