Inside the Factory: The Real Difference Between Gangsaw and Cutter Slabs

When client calls or email comes in, we often get asked questions ranging across topics like finishes, thickness, quality, and price, of course. But a recent inquiry from a US-based client got us thinking about one topic we don't discuss enough: size.

A large US-based fabricator requested a quote for cut-to-size slabs measuring 111 (Length) x 42 (Width/height) inches in 2cm thickness. We at Stone Galleria presented them with two quotes based on different cutting technologies —and that led to a number of unexpected questions:

• What's the difference between gangsaw (large) slabs and cutter (vertical or small) slabs?
• Is there a quality difference between the two?
• How much does the price actually vary?
• If vertical slabs are so much economical, they must be inferior in quality — right?
• Why are gangsaw slabs so much more expensive than vertical slabs?
• What about breakage ratios during transit?

These weren't casual questions. They came from someone who works with stone every day.

That's what led us to write this piece. If a seasoned fabricator who deals in slabs day in and day out has this many questions, it must be even harder for a regular homeowner to make sense of it all. When we tried Googling these questions ourselves, the answers were vague and surface-level. When we turned to many popular AI tools, we got generic answers that miss factory-floor realities.

So in this piece, we'll give you the factory point of view—what we actually do on the ground and why we do it. No marketing fluff. No AI-generated generalizations. Just what we see, cut, pack, and ship every single day.

What exactly are gangsaw and vertical slabs?

Before we get into quality, price, or transit, let's start with the basics—what these two terms actually mean.

In the granite industry, you'll hear slabs referred to by their cutting method or their size. Gangsaw and cutter (also called vertical) are the two most common terms, and they're often used interchangeably with "large size" and “vertical size." But the names themselves have a history worth understanding—and once you know what they really refer to, the rest of this guide makes much more sense.

Let's start with gangsaw.

What Does "Gangsaw Size Slab” Actually Mean?

A gangsaw is the name of a machine originally used to cut marble — multiple blades sawing several slabs at once, usually in large formats. Since marble generally (but not always) comes in big slab sizes, the term "gangsaw size" became shorthand for large-format slabs.

Granite borrowed the name. But here's the catch: granite cannot actually be cut on a gangsaw machine because it's too hard (high on the Mohs scale). Large slabs of granite are cut using multi-wire machines instead.

So in granite, "gangsaw size" doesn't describe the machine—it describes the size. Typical large granite slab size:  

• Length: 100 to 140 inches
• Height or Width: 60 to 82 inches
• Thickness: 3cm for US market and 2cm for rest of world. 

That's all it means. A size category, not a cutting method.

What Is a Cutter Size Slab?

Cutter is the name of a machine that uses circular diamond blades to slice granite blocks into slabs. Depending on the machine, it can have anywhere from 1 blade to 5, 10, 13, 14, or even 21 blades cutting simultaneously.

Unlike a gangsaw, the cutter is actually used on granite every day. It's the workhorse of most granite factories.The format it produces is different, though:

• Length: 100 to 140 inches (Can go up to 156 inches)
• Width or Height: 20 to 42 inches (max 43 inches)
• Thickness: 16mm, 18mm, 20mm and 30mm. Custom sizes can be done easily.

Because the length is much greater than the width, these slabs have a tall, vertical look—which is why they're also called vertical-size slabs.

The length can be similar to a gangsaw, but the width is where the real difference lies—cutter slabs are narrow by design.

Cutter Size Slabs Vs. Gangsaw Size Slabs: What is the Difference in Quality?

Now that you understand how these two types of granite slabs are cut, the real question comes up: is there actually a difference beyond size?

To answer that, we need to go backward—to the raw material. 

The only raw material needed to produce a granite slab is a granite block. Everything else in the process—water, blades, wires, abrasives, polish—is just consumables. And here's the key point: 

The blocks used for gangsaw slabs and cutter slabs come from the same quarry.

Whether it's Blue Dunes, Black Galaxy, or any other granite, the blocks are sourced from the same mine, the same pit, and the same seam. Same colour. Same pattern. Same stone.

In fact, it's common for us to receive a large block from the mine and split it into smaller blocks based on which machine it's heading to. That same block could have gone to a multi-wire machine to produce a large-format slab or to a cutter to produce vertical slabs.

It's literally the same stone—just cut differently.

So Is There No Difference At All? Not Quite.

We're not saying the two are identical in every way. There are differences — some subtle, some more noticeable. Let's start with the subtle ones.

As we mentioned earlier, the real difference lies in how they are cut.

Multi-wire is advanced technology and expensive—most of these machines are imported from European countries (Italy being the leader) or from Brazil. 

Cutter machines, on the other hand, are usually either made in India or imported from China. They're more affordable and far more common on factory floors.

But the bigger story is how each machine cuts the stone — and that's where the real differences come from.

The wires descend vertically through the block, all entering simultaneously along the full length of the slab. One continuous downward motion, all wires working at once.

The blade travels horizontally along the length of the block, spinning at high RPM. Between passes, the blade steps down to cut the next layer.

Two real differences come out of this:

1. Entry gouge — only on cutter slabs.

Every pass begins with the blade striking the top corner edge of the stone. High RPM plus blade thickness means the entry impact on the top edge a few millimetres deep. That edge then won't lie flat on the polishing bed, so the finish along it ends up uneven or missing.

In practice, the customer rarely sees it — the nicked edge isn't included in the measurement on random slabs, and it's trimmed out during fabrication or at the installation site for cut-to-size work. Multi-wire slabs don't have this problem.

2. Warp — and the conventional wisdom is backwards.

Cutter slabs typically warp 1–1.5 mm. The blades are thick and rigid, so they cut a relatively straight line.

Multi-wire slabs warp 1.5–2 mm on average, and up to 4–5 mm on softer stones. The wires are relatively thin and flexible — they deflect toward softer mineral zones and wear unevenly as they go, so they follow the path of least resistance instead of a straight line.

So "gangsaw is flatter than cutter" is often wrong. The rigid blade holds its line better than a flexible wire does.

Now the Perceived Differences

You'll often hear buyers say things like “We don't want cutter sizes; they're inferior,” or “Gangsaw slabs have better colour,” or “Large slabs have better pattern”. These are perceptions, not facts. And here's why.

As we just explained, the same granite block could have been cut into either format. Running a block through a cutter machine doesn't change its colour. It doesn't change its pattern. The stone is the stone.

So where does the perception come from? Size and display.

A large slab naturally showcases colour and pattern better—there's simply more surface area for the eye to take in. And in most stone yards, large slabs are displayed at eye level, standing tall on A-frames, fully lit. 

Cutter slabs, on the other hand, are usually stored below eye level, stacked or leaned in ways that don't do them any visual justice.

Same stone. Different presentation. That's what creates the illusion of quality difference.

The Bottom Line on Quality

In a good factory, both gangsaw and cutter slabs go through the same finishing process—same abrasives, same resin, same epoxy, same fibre netting. The polish, the treatment, and the finish—it's all identical.

The end result? Functionally the same quality of slab — once the entry gouge is trimmed during fabrication, what reaches the customer is comparable in finish, durability, and performance.

What is the price difference between large slab and cutter-size slabs?

To understand the price gap, we need to go back to two things that we've already discussed: raw material and perceived difference, along with cutting technology.

1. Raw material cost

Because of the perceived value of large slabs — and because large-format slabs are heavily exported — most quarries and mines (not all) charge extra for large blocks. Smaller blocks, which go to cutter machines, are priced lower at the source itself.

So the cost difference starts right at the quarry, before a single slab is even cut.

2. Cutting technology

As discussed multi-wire machines are imported. They're expensive to acquire, expensive to maintain, and expensive to operate. Cutter machines — whether made in India or imported from China — are significantly cheaper on all three fronts.

That cost difference gets passed on to the slab price.

3. Everything else is mostly equal.

With thickness, finish, packing, and transportation being the same, the price gap between a gangsaw and cutter slab comes down almost entirely to these two factors.

There are smaller variables too—handling, labour, yield — but compared to raw material and machine cost, they're minor.

That's why gangsaw slabs cost more. Not because the stone is better, but because the block costs more and the machine costs more.

In most cases, gangsaw slabs are priced 30 to 100% higher than cutter slabs of the same granite—purely because of these two factors.

What About Breakage and Transit: Large Slabs Vs Small Slabs

Both gangsaw and cutter slabs can travel safely, domestically or overseas, by road or by sea. (Air transport isn't feasible for either, simply because stone is too heavy.)

The key factor is how they're packed, not which type they are.

Here's what most people don't realize: if both slab types are packed the same way, there is absolutely no difference in breakage. The stone is the same, the density is the same, and the handling principles are the same.

What actually happens in practice is this — because gangsaw slabs carry a higher price tag, they usually get packed more carefully. Stronger crates, better cushioning, more attention to details. That extra care costs more, and it gets added to the final price. Cutter slabs often get packed to a lower standard simply because the stone itself costs less and the economics don't justify better packing.

But that's a packing decision, not a stone or size limitation. In our experience, breakage happens due to handling errors, not slab format.

On container and vehicle loading:

Whether it's a shipping container for export or a truck for domestic movement, the capacity is the same in square footage for the same stone. Density per square foot doesn't change based on slab size—a 10 ft slab and a 7 ft slab of the same thickness weigh the same per square foot. So there's no transit cost advantage or disadvantage based on format alone.

Which one should you choose?

Honestly? There isn't one — and that's the point.

Both gangsaw and cutter slabs come from the same quarry, the same block, and the same stone. One is cut on a larger, more expensive machine and comes in a bigger format. The other is cut on a smaller, more common machine and comes in a narrower format. The finishing, the polish, the durability—all the same.

The differences we've covered are real, but they're factual, not qualitative:

• Size: gangsaw is larger, cutter is narrower
• Price: gangsaw costs more due to raw material and machine economics
• Presentation: Gangsaw shows better in stone yards simply because of size and display
• Packing: higher-priced slabs usually get packed more carefully, but that's a choice, not a limitation

Which one fits your project depends on your application, your budget, your design preference, and your tolerance for seams. Those are decisions only you can make.

At Stone Galleria, we work in both sizes of slabs. We're not here to tell you one is better than the other—because that wouldn't be without fair. We're here to lay out the facts so you can decide what makes sense for your project.

Same stone. Different cut. The difference isn’t in the material — it’s in how you choose to use it.