This mystical sterling silver ring is available in several different gemstones. *All natural semi-precious larimar gemstone. *Measurement for Center Stone is Approximately 8mm Round *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.