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Clean regularly, check for cracks, and inspect the chimney annually for safety.

You can’t change the color of the stone, but you can update granite countertops without replacing them by painting them. Because granite is a porous material, you’ll want to seal them first before painting them so that the paint doesn’t hurt the surface. This is important because you don’t want to devalue your counters by damaging the original surface; even if you don’t like the color now, you or a new homeowner may want to remove the paint someday and return them to their original color. You can also cover them with 

A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

You don’t need to seal German smear; the mortar is already acting as a sealant for the bricks. You can seal the mortar, though, if you wish to further protect the area from stains, moisture, and dirt or make it easier to clean and maintain. Note that a sealant will make the mortar appear more glossy.