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It all comes down to rarity and demand. Granite rocks with unique patterns or rare colorways like red, purple, and blue are more expensive than traditional designs. Some types of blue granite are extremely rare, like Azul Aran and Blue Bahia, driving the price up even further. The most expensive type of all is a unique design called Van Gogh granite. As the name suggests, it sort of looks like a painting. 

Yes, Corian® and other solid surface countertops can be cut with standard woodworking tools like a circular saw or a jigsaw, but using the correct blade is crucial for the best results.

The recommended blade is a tungsten carbide-tipped blade, often called a solid-surface planer or triple chip grind blade. This type of blade is hard enough to cut through the material effectively. For a jigsaw, a fine-tooth down-cutting blade should be used.

It is important to note that a diamond blade is not necessary. Diamond blades are designed for harder materials like natural stone, concrete, or brick, and Corian is not a natural stone.

Using blades designed for wood is not recommended as they can cause microfractures that weaken the countertop's edges. While a tungsten carbide blade provides a much cleaner cut, the resulting edge will still be rough and must be sanded and smoothed to prevent microfractures from developing over time.

Deciding between marble and granite for kitchen countertops depends on your personal priorities, budget, and style. Both materials have similar costs for material and installation.

Marble offers a luxurious aesthetic and timeless beauty, but it is more expensive and requires more maintenance. It is susceptible to staining and etching from acidic substances like coffee, wine, or tomato sauce if spills are not cleaned up quickly.

Granite is highly durable, heat-resistant, and easier to maintain, making it a practical choice for busy kitchens.

Both materials should be sealed to protect against damage, but they can still be vulnerable to stains if spills are left on the surface for too long.

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.