The fireplace hearth sits under the fireplace to protect the floor from the heat of the fire. Traditional Victorian hearths would have been slate, but for ease of use customers often prefer the polished granite which is easy to maintain.
The solid hearths are suitable for gas fires or bedroom fireplaces with small grates. Larger solid fuel fireplaces require sectional hearths which have been cut into sections and glued together. This allows for expansion/contraction from the heat of the fire.