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Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

In many cases, it’s worth it to restore stone. Stone restoration generally costs less than replacing the stone entirely, helping to save on the cost of your project while still giving your home’s stone a polished appearance. However, if your stone is very cracked or crumbling to the point of compromising the structural integrity of your home, you may want to consider replacing it. Stone flooring costs range from $6 to $20 per square foot on average.

Yes, onyx countertops can scratch easily—especially if they’re not adequately sealed. But with the proper maintenance (which includes re-sealing the countertops to protect them from damage), you can prevent your onyx countertops from scratching and repair any damage quickly to prevent it from worsening.

If you're looking to break up a stone slab or some landscaping stone, the process is very similar to breaking up a boulder, and may in fact be easier because it is easier to access and not as deeply buried into the ground.