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Yes, onyx is more expensive than granite. Its higher cost is due to its rarity, delicate nature, and the specialized care it requires. While granite countertops typically cost between $2,000 and $4,000, onyx is considered a premium material. Its luxurious, translucent appearance and unique ability to be backlit also contribute to the higher price. In terms of durability, granite is a hard, durable surface, whereas onyx is more delicate and can be damaged if not handled carefully.

One of the best ways to use bar-height countertops is as a divider. If you have an open concept home, this can visually separate your kitchen from your living space. This countertop is also ideal for entertaining. You can cook in your kitchen, while your guests can sit at the island and be at a similar level. 

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.

Both marble and quartz are decent kitchen countertop choices for different reasons. Marble provides an elegant look that’s sure to attract eyeballs, which can add value to a home. However, this isn’t the most durable material around and is easily scratched and stained. Quartz may not offer a classic look like marble, but it is available in a wide range of colors and patterns. It’s also durable, with the ability to resist scratches and stains.