Commercial vs. Premium Grade Stone: What’s The Difference?

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When searching for natural stone slabs, you will probably see that different slabs have different grades. This can be a little confusing to understand, as many think “granite is granite” or “marble is marble”. However, the type of grade of a stone slab actually makes a huge difference in not only price but the overall quality as well.

At Firenze International, we are your go-to natural stone slab supplier. Whether it’s quartzite, marble, granite or more, our natural stone slabs are of the highest quality around. Below, we discuss the differences between commercial and premium grade stone and why it’s important to understand the difference. 

When it comes to natural stone, the grade of the stone is determined by a number of factors. Here are some things determine the grade of a stone slab:

  • Color

  • Veins

  • Pitting

  • Marking

  • Thickness

  • Amount of soft minerals

  • The country in which it was quarried

Grades of Natural Stone

When discussing the grades of natural stone slabs, there are three categories under which every slab can fall under. Here are the different grades of natural stone:

Low-grade (Commercial)

Low-grade stone, also known as commercial grade, is the lowest grade of stone. Commercial grade stone is usually cut thinner than other slabs, about ⅜ of an inch, and also does not vary much in color. This grade also has a significant amount of soft minerals mixed within the stone.

Mid-grade (Regular)

Mid-grade stone is the most common type of natural stone slabs. Mid-grade is usually cut to a thickness of ¾ of an inch, and is pretty average in color, or at least not as rare or exotic. This grade is often harder than low-grade stone, and can even be harder than the more expensive slabs. 

High-grade (Premium)

High-grade stone, also known as premium grade, is the best of the best. This grade of stone is usually quarried from the best quality of countries and is at least ¾ of an inch thick. Premium grade stone also usually has a unique coloring, which includes uncommon veining and patterns. 

The difference between commercial and premium grade

So now you’re probably wondering, what is the actual difference between these two grades. Well, other than what has already been listed, commercial grade stone is used more in hotel and apartment settings. This is because low-grade stone is normally quarried at a much higher abundance than premium grade, which also makes commercial grade the cheaper option. Although each grade of stone is natural, premium grades are generally harder, more durable and overall better quality. This is because lower-grade stone usually contains more soft minerals, making it easier to become damaged.

When purchasing stone slabs, be sure to ask your fabricator about the grade of the natural stone. 


At Firenze, we offer premium, high quality natural stone that is quarried from only the best locations around the world. To learn more about our services, or to view our inventory, visit our website today!

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