Remove the old table top by carefully cutting it from the base of the table, or by unscrewing.
Take this top to a granite fabricator, using it as a template for a new top. Select a granite edge treatment.
Clean and refinish the legs and base of the table. Add bracing to the base if necessary.
Dry-fit the granite top on the base and mark the underside of the granite where the corners of the base end.
Remove the granite top. Run a bead of carpenter's glue along all the surfaces of the top of the base.
Replace the top, lining up the corner markings. Let the glue dry completely before using.
Select the type of base you want from copper, steel, bronze or wrought iron. Common bases are a square column, round or T-shaped, and are either 48 or 54 inches high.
Order the table top from a granite fabricator in the size and edge finish you want.
Assemble the base following the manufacturer's directions. Screw the base legs together. Tighten with nuts.
Dry-fit the table top onto the base and mark the locations for holes on the underside of the top.
Drill holes at least 1 inch deep, and attach the top to the table base using 1-3/4-inch screws.