Look at the beautiful Herkimer Diamond (Quartz). Shimmering rough center gemstone encircled with a radiant circle of sterling silver. *All natural semi-precious Herkimer Diamond (Quartz) gemstone. *Measurement for Center Stone is Approximate between 12-17mm (will range) *Sterling Silver/.925 Silver This picture is an representation of the type and quality of the gemstone you will be receiving. As you know, there are slight variations due to the natural character of this product. -All information about the metaphysical properties of crystals is for reference only. It is a combination of research on how gemstones have been used by different cultures today & throughout history. We do not recommend using crystals as a substitute for conventional medical advice.