The thickness of Viet Nams Cam Thuy Bluestone BlueStone slabs can vary depending on the specific product and manufacturer. However, the most common thickness for BlueStone slabs is typically around 20-30 millimeters (0.8-1.2 inches). It is important to note that different suppliers may offer slabs with varying thickness options, so it is advisable to check with the manufacturer or supplier for the exact thickness of the specific product you are interested in.