Stone: Opalite or Peru chalcedony
Frame Material: 18K Gold Over Solid Genuine .925 Sterling Silver.
Shape: Smooth bar shape with 2 top rings, backside is flat.
Measurement: 42mm long 12mm wide, stone size is 40mm by 10mm.
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.