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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.

The best tool for cutting countertops depends on the type of countertop material. For some softer materials, like laminate (Formica) and butcher block, you can use a hand saw, but most experts recommend power saws like circular saws, since these make the job go faster and easier and give more even results. However, power saws and circular saws are dangerous if used incorrectly, and they can be so powerful that they damage or chip laminate, stone, and other types of countertops. For this reason, you should take safety precautions and use best practices to prevent damage.

You attach solid surface counters with construction adhesive. Once your slab is ready, you fit it to the wall, apply the adhesive, and secure it in place with clamps until the glue dries. This usually takes several days. 

Afterward, you install the backsplash, faucets, and more. At this point, you can caulk the counter, allow it to dry for 24 hours, and then you're done with the installation.

The minimum counter depth for a kitchen island is around the same as for a standard kitchen countertop, which is around 25 to 26 inches. This depth allows adequate room for food preparation, dining, and working on the island. However, as with other kitchen countertops, depth can vary based on specific needs and preferences in your household.