WHAT IS SG OF 19MM STONE?

The specific gravity (SG) of a 19mm stone can vary depending on the type of stone. For example, granite typically has a specific gravity of around 2.6 to 2.8, while limestone may have an SG of about 2.3 to 2.7. To determine the exact SG, you would need to know the specific type of stone and possibly conduct a measurement if it's not readily available in literature.