Caribbean Calcite tumbled semi-precious stone approximately 20-30mm in size. *Sold in approximate 0.5KG increments. *All natural. *Due to the production process and shipping of tumbled stone, it makes it difficult to give a the exact number of tumbled stones per bag. Approximate range of pieces per 1kg bag for our 20-30mm tumbled stone is about 40-60 pieces. *We receive many shipments of tumbled stone every month and we give specific requirements to our suppliers, however occasionally a random larger or smaller stone may be present in your 1kg bag. We do our best to make sure this doesn't happen but a random large or smaller size may be present. 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.