There are a few ways to update an old stone fireplace. One way is to paint it. Another way is to replace the mortar between the stones. A third way is to add new stones to the fireplace. If you choose to paint the stone fireplace, you will need to clean it first. You can use a pressure washer or a wire brush. Once it is clean, you can apply a coat of primer and then two coats of paint. If you choose to replace the mortar between the stones, you will need a trowel, sandpaper, brick cleaner, putty knife, and mortar mix. You will also need latex gloves and safety glasses.

To update an old stone fireplace, you can start by removing the existing mantel and chimney cap. Once they are removed, you will be able to see if the fireplace is made from brick or stone. If it is made from brick, you can paint it with a mortar color that matches the stone. If it is made from stone, you can use a color enhancer or sealant to make it look new. After the paint or sealant dries, put the mantel back in place and install the chimney cap.