G623 Granite Kerbstones: Grey Kerbs in 60mm & 200mm
Kerbs are the hardest-working stone on any street. They take tyre impacts, snowplough blades, freeze-thaw cycles and de-icing salt, year after year — and they’re expected to do it without cracking, spalling or fading. That’s why so many road and landscape projects still specify granite, and why G623 is one of the most popular choices: a consistent mid-grey granite with one of the best price-to-performance ratios of any kerb stone on the market.
The photos in this article are from a kerbstone order we just finished in our factory: G623 granite kerbs in two sections — 60mm and 200mm — photographed during final checking and packing, before export.
What Is G623 Granite?
G623 is a grey granite quarried in China, known for its even, fine-to-medium grain — a light-to-mid grey base with fine black and white speckling. For kerbs and paving, that consistency matters more than drama: hundreds of linear metres have to read as one continuous line of the same colour, and G623’s tight colour tolerance from block to block makes long runs look uniform.
It’s also a high-volume quarry stone, which is exactly why it’s so cost-effective. The raw material supply is deep and stable, so pricing stays competitive even on large orders — a big reason G623 kerbs show up on municipal roads, residential developments and commercial landscaping projects all over the world.
The Two Sections in This Order: 60mm and 200mm
This project used two kerb sections for two different jobs:
| Section | Typical use | Why |
|---|---|---|
| 60mm | Garden and landscape edging, path borders, light-duty kerbs | Slim profile that’s easy to handle and set; enough to hold an edge line and separate surfaces cleanly |
| 200mm | Road kerbs, street edges, parking areas, driveways | Deep section that buries well for stability and leaves a solid upstand to protect the pavement edge against vehicle loads |
Both sections in this run were cut to 600mm lengths, sawn-finished, with a chamfered top edge — the chamfer takes the sharp arris off the exposed corner, which is the first place a kerb chips in service.
Granite Kerbs vs. Concrete Kerbs
Precast concrete is the main alternative, and it’s cheaper per metre on day one. The comparison changes over the life of the street:
| Granite kerb (G623) | Precast concrete kerb | |
|---|---|---|
| Service life | Decades; often outlasts the road surface itself | Typically 15–25 years before spalling and edge loss show |
| Impact resistance | High — dense natural stone takes vehicle knocks without crumbling | Chips and cracks at edges under repeated impact |
| Freeze-thaw & de-icing salt | Very low water absorption; resists salt scaling | Prone to surface scaling and reinforcement corrosion over time |
| Appearance | Natural grey that weathers evenly; no pigment to fade | Pigment fades; patches and repairs stand out |
| Maintenance | Essentially none | Periodic replacement of damaged units |
| Upfront cost | Higher per metre | Lower per metre |
| Cost over 30+ years | Usually lower — install once | Replacement cycles add up |
For a private driveway or garden, concrete can be a reasonable economy choice. For roads, public realm work and any project where digging up a failed kerb line costs real money, granite is the buy-once option.
Checked Piece by Piece Before Packing
Kerbs are a dimensional product: if the section drifts, the line wobbles and the installer pays for it on site. Before packing, every piece in this order was tape-checked — section height, length and thickness — the way you can see in these photos from the factory floor.
The chamfer is checked at the same time. A clean, even chamfer along the full length is what keeps the exposed top edge of the kerb from chipping during transport, handling and years of service.
Export Packing
Finished kerbs are stacked on wooden pallets, film-wrapped and steel-strapped, so the bundles arrive tight and the edges arrive intact. Granite is forgiving stone, but export packing is what makes sure a 600mm kerb leaves the factory and arrives on site in the same condition.
Where G623 Kerbs Are Used
- Municipal roads and streets — the 200mm section is the workhorse for standard road kerb lines
- Residential developments — consistent grey that pairs with asphalt, concrete paving and granite setts
- Commercial landscaping — car parks, plaza edges and pedestrian zones
- Gardens and paths — the 60mm section as a crisp, permanent edge that won’t rot like timber or crumble like thin concrete edging
Because G623 is a neutral mid-grey, it sits comfortably next to almost any paving material — which is another reason specifiers reach for it when a project mixes several surface materials.
How G623 Compares With Other Grey Granites
Buyers often ask how G623 stacks up against the other common grey granites. G603 is a slightly lighter grey with a similar fine grain and a similar price position — the choice between them is mostly about the exact shade your project needs. G654 is a much darker charcoal grey: striking, but noticeably more expensive and visually heavier along a long kerb line. G623 sits in the middle — a true mid-grey that reads neutral against asphalt and concrete, at one of the most competitive price points of the three. For long kerb runs where colour consistency across hundreds of metres matters more than a dramatic shade, G623 is usually the practical specification.
FAQ
What sizes do G623 kerbstones come in?
This project used 60mm and 200mm sections in 600mm lengths. Kerbs are cut to order, so sections and lengths can be produced to your project specification — send us your drawings or kerb schedule for a quotation.
Why is G623 considered good value?
It’s a high-volume quarry granite with a deep, stable supply of raw blocks. You get granite’s service life and impact resistance at one of the lowest per-metre prices of any grey granite — which is why it’s specified so widely for roads and landscaping.
What finish and edge do the kerbs have?
The kerbs in this order are sawn-finished with a chamfered top edge. The chamfer protects the exposed corner from chipping and gives the finished kerb line a clean, deliberate look.
How are the kerbs packed for export?
On wooden pallets, film-wrapped and strapped, checked piece by piece before packing. See the packing photo above — what you see is how your order ships.
Can I order the 60mm and 200mm sections together?
Yes — mixed-section orders are common, since most projects need road kerbs and lighter landscape edging in the same shipment. Both sections in this article shipped as one order.
Get a Quote for Your Kerb Project
If you’re specifying kerbs for a road, development or landscape project, send us your sections, lengths and quantities — we’ll quote factory-direct, cut to your specification. You can also see how we finish outdoor granite in our flamed granite steps.
Ji Yuan Stone — natural stone factory, 20+ years, 900+ products, exported to 126+ countries. Request a quote for G623 granite kerbstones.