Beautiful tumbled semi-precious Petrified Wood gemstones that range in size about 10-20mm in length. *Sold in 0.5kg/1.1 lbs. increments. *All natural semi-precious gemstones *Tumble size range approx.10-20mm in size This picture is a 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.