Stone: Green onyx , crystal
Frame Material: 18K Gold Over Solid Genuine .925 Sterling Silver.
Shape: Faceted square shape.
Measurement: 23mm with both rings, the stone size is 15mm.
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.