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While onyx is among the most expensive countertop stones, it’s not always the priciest. It is generally cheaper than Calacatta marble, which is highly sought-after for its rarity and bold veining. However, onyx still commands a premium price due to its unique translucency and delicate nature.

Concrete countertops require regular upkeep to maintain their appearance and durability, and are generally considered harder to maintain than other materials. For daily cleaning, use a mild, pH-neutral cleaner and avoid harsh, acidic products that can damage the sealant. It is crucial to wipe up spills immediately, especially from acidic substances, as concrete stains easily. To protect against stains and moisture, the countertops must be resealed periodically—at least once a year, if not more frequently. Additionally, use a cutting board to avoid scratching the surface. Be aware that concrete is also prone to cracking over time, which may require repairs.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

Epoxy is typically more affordable than granite, especially if you’re choosing a high-end slab. Most granite countertops cost $75 to $145 per square foot to install, with high-end varieties topping $185 per square foot. 

In contrast, epoxy countertops cost $50 to $150 per square foot to install. The material costs for epoxy are significantly lower than granite, but installation costs can be higher. Rather than simply cutting granite countertops to size before installation, your contractor will need to carefully pour the epoxy over an existing surface.