G603 Granite (Padang Cristallo)

What Is G603 Granite?

G603 granite — also traded as granite G603, and widely searched as "G603 granite China" to distinguish it from European alternatives — is a light grey Chinese granite with a fine-to-medium grain and evenly distributed dark mineral speckle, quarried in Fujian Province and sold internationally as Padang Cristallo, Padang Crystal, China Cristal (G603a), White Serena and Serena White. In the Chinese trade it is known as 芝麻白 — "sesame white" — for the speckled pattern that gives the whole 600-series its name. It is close in appearance to the Italian granite Bianco Sardo, and it is one of the most widely used light granites in the world for grave markers, inscription slabs and pedestrian paving.

Two things about its identity are worth establishing at the outset, because both cause problems in procurement.

The code is a trade identifier, not a material specification. "G603" does not certify density, water absorption, quarry source or finish. Two suppliers can ship material that is honestly labelled G603 and behave differently on site, because the quarry benches differ, or because the colour has been graded differently. Everything that matters commercially has to be confirmed per lot.

Its quarry origin is reported inconsistently. Published sources place G603 in Fujian, in Wuhan, and in Guangxi — and it is possible that more than one of these is right, with material from different quarries traded under the same code. The practical consequence is not that one origin is inferior, but that you should specify by sample and lot, not by code alone. Ask for the quarry, and ask whether the sample you approve comes from the block you will receive.

G603 Technical Specifications

The figures below are drawn from multiple published sources, including supplier test data and the Chinese national standard references. Where sources disagree, the range is shown rather than a single figure — the disagreement itself is useful information about how tightly G603 is specified in the market.

Reading these numbers honestly

The water absorption figure is well-behaved. Most published data lands in a narrow band around 0.30–0.33%, which suggests the material itself is consistent and the outliers are testing or transcription differences rather than real variation. At that level, G603 comfortably meets the ≤0.40% GB/T requirement and behaves well outdoors. It is roughly twice as absorbent as G684 basalt and comparable to G654.

Where the range widens, look at who is publishing it. One supplier's marketing description states that G603 has "zero water absorption" while its own technical table on the same page lists 0.33%. We mention this not to single anyone out — it is a common pattern in stone marketing — but because it illustrates why the code alone is not a specification. Ask for a test report, and read the numbers in the table rather than the sentence above it.

Compressive strength figures of 150–220 MPa are all far above what paving or cladding will impose. As with most dimension stone, strength is not your constraint on a normal project. Dimensional tolerance, colour consistency and packing are.

G603 in Memorial and Headstone Work

G603 is one of the most widely used light granites in the memorial trade, and it is worth understanding why before specifying it — along with the one design decision that trips people up. If you are sourcing a G603 sesame grey granite headstone, a grey granite G603 tombstone or a G603 grey granite monument, the material behaviour described in this section is what determines whether the memorial still reads well in fifty years.

Why G603 suits memorials

The stone resists staining, scratching and weathering; it is frost-proof and UV-stable; and it is roughly 30% harder than marble, which matters for a stone that will stand outdoors for a century or more. Its low water absorption means algae and staining have less to work with than on a more porous stone — though on a light-coloured stone, any biological growth is more visible than it would be on a dark one, so occasional cleaning is generally part of the maintenance plan rather than optional.

Because G603 reads as a clean, neutral light grey, it also sits well in cemeteries where the surrounding stone is mixed. It does not compete visually with neighbouring memorials the way a very dark or very figured stone can.

Lettering: the design decision that matters

This is the most practical thing we can tell you about G603 headstones. On a light grey background, black lettering gives the strongest contrast and reads most clearly from a distance, which is why it is the traditional choice. Gold leaf also works well and is common for higher-grade work. White or cream lettering, however, has very little contrast against the stone and is difficult to read from any real distance — it photographs acceptably and disappoints in person. If a design calls for white lettering, that is worth a conversation before the stone is cut, because the contrast cannot be recovered afterwards.

G603 accepts sandblasting, laser etching, hand carving and painted or gilded infill. The fine, uniform grain holds a clean engraved line well, which is one of the reasons it is favoured for inscription slabs.

Common memorial forms

• Slant headstones — a rectangular stone with a forward-angled face, either plain or with a curved top, offering good readability in a compact footprint.
• Upright and flat markers — the standard cemetery forms, single and companion (double) widths.
• Obelisk and stepped monuments — cut from 2–3 cm slab thickness in many designs, assembled on a stepped base; the light grey takes crisp shadow lines well. This and the upright form are what most buyers mean when they search for a G603 grey granite monument tombstone.
• Carved memorials — angel, floral (hand-carved lilies are common) and other figurative work. G603 is a workable carving stone, though its hardness means carving is a slower process than on marble.
• Irish and European styles — Celtic cross and Irish headstone forms, widely produced for the Irish and UK markets.
• Sub-bases and plinths — a common polished sub-base size is 93 × 32 × 7.5 cm, which can carry additional lettering or serve as a foundation course.

Standards worth naming in a specification

For North American memorial work, ASTM C615 is the relevant granite dimension-stone standard and ASTM C119 provides the hardness classification (G603 typically reports 6–7 Mohs). For European installation, CE marking applies, and some suppliers list EPR France–Germany compliance. Naming the standard you require in the purchase order is a low-cost way to make the specification enforceable.

G603 vs G654 and the Sesame Family

G603 and G654 are the two most commonly confused Chinese granites, and the difference is almost entirely about tone.

G603 is the light one — a white-to-light-grey base with even dark speckle, sometimes described as "sunny day" against G654's "cloudy day." G654 is the dark one — mid-grey to anthracite with a fine even crystal grain, marketed as Padang Dark and known in Chinese as 芝麻灰 or, confusingly, 芝麻黑. The family runs light to dark: G603 (sesame white) → G614 (sesame grey) → G654 (sesame black).

Three practical differences follow:

• Price. G603 generally sits in the lower price tier, with G654 above it. Both are economical stones; the gap reflects demand and finish requirements more than scarcity.
• Colour consistency. This is where G603 demands more attention. Because light stone shows colour variation more readily than dark, poorly graded lots of G603 appear patchy once laid — a white paver sitting next to a grey one is far more noticeable than the equivalent variation in a dark stone. Quality control at the factory is the only real defence.
• Finish behaviour. Light granite changes appearance markedly with finish. Polished G603 is bright and reflective; flamed G603 reads considerably lighter and more matt. Approve the finish on a labelled physical sample rather than choosing from a photograph, because the same stone in two finishes looks like two different materials.

The two are also used as substitutes for one another in projects where the design can take either tone, since they share a similar consistent speckled pattern — which is another reason to specify the code explicitly if you need one and not the other.

Available Products and Formats

G603 Slabs

Standard slab production covers small slabs at roughly 60–90 cm up × 180–300 cm up and big slabs at 120 cm up × 240 cm up, in 2 cm and 3 cm thicknesses, with thicker material available to order. Polished, honed and flamed finishes are all produced. Big slabs suit cladding, feature work and large-format flooring; small slabs are the standard format for fabrication into headstones, countertops and cut-to-size work.

G603 Tiles and Cut-to-Size

Standard tile sizes include 305×305, 305×610, 457×457, 600×600 and 600×300 mm, along with the common imperial equivalents — 12″×12″, 12″×24″, 16″×16″, 18″×18″ and 24″×24″. Thicknesses of 10, 12, 15, 20, 25 and 30 mm are produced. As with most Chinese granite supply, cut-to-size dominates: most buyers send a cutting list and receive calibrated material to a stated tolerance.

G603 Paving Stones and Cobblestones

G603 is a workhorse paving granite and is supplied in an unusually wide range of formats.

G603 light grey granite cobbles and setts are cut in standard cube sizes — 10×10×10, 10×10×8, 10×10×6, 10×10×5, 10×10×3, 9×9×9, 9×9×5, 8×8×8 and 5×5×5 cm — along with rectangular setts such as 10×20×10 and 20×10×10 cm. Thicknesses run from roughly 2 cm to 10 cm. For faster installation, setts are supplied mesh-mounted in panels: 70×50 cm rectangles, 85×50 cm fan or sector patterns, circular panels, or to drawing.

Flamed paving is the standard exterior format, supplied in sizes including 10×10 cm, 60×40×3 cm, 50×50×3 cm, 75×46×2 cm and 77×60×3 cm, with paver thicknesses from 30 mm to 100 mm. The heavier thicknesses are used for driveways and vehicle-trafficked areas; 30 mm is typical for pedestrian paving.

G603 Kerbstones and Curbstones

Kerbstones are cut to national standards as well as to project drawings, and this is one of the areas where G603 is specified in volume. Common metric sections include 100×250 mm and 150×250 mm face profiles in 600–1000 mm lengths, along with 600/800/1000 × 150/120/100 × 300/250/200 mm variants. UK-style kerbs are produced in sections such as 15×30 cm face at 90–120 cm lengths; Finnish styles include the V-profile range (V30/V22/V17/V15) and R-profile range (R20/R17/R15/R10); German market sections are produced to their respective standards. Radius kerbs, transitions and corner units are cut to drawing.

G603 Steps and Window Sills

Step treads and risers, window sills, thresholds and coping are cut to project dimensions in 30 mm and 50 mm thicknesses, with flamed, honed or polished surfaces depending on whether the application is exterior or interior. Anti-slip grooving and nosing profiles are produced to drawing.

G603 Monuments and Memorials

Covered in detail above. The short version: G603 is one of the two or three most commonly specified Chinese granites in the international memorial trade, produced in the full range of cemetery forms. Custom CAD drawings and one-off designs are accepted, and minimum orders can be as low as a single piece for a bespoke memorial.

Surface Finishes

G603 is produced in more finishes than most granites, and because it is a light stone, the choice changes its appearance more dramatically than it would on a dark material.

Polished

The brightest and most reflective finish. Polished G603 has a clear, cool grey appearance and is the standard finish for headstones, inscription slabs and interior flooring. It is not slip-resistant when wet and is generally not specified for exterior paving.

Flamed (Thermal)

The standard exterior finish. The surface is textured and matt, giving grip and hiding dust and wear. Flamed G603 reads noticeably lighter than polished — sometimes almost silver — because the textured surface scatters light. If your design was approved on a polished sample and the project needs flamed paving, approve the flamed sample separately.

Honed

A smooth matt finish that retains the stone's colour without the mirror. Common for interior floors, stairs and wall cladding, and for exterior work where a flamed texture is visually too rough.

Bush-Hammered and Sandblasted

Bush-hammering produces a pronounced, evenly pitted texture with high grip — used on ramps, steps and heavy-traffic areas where safety outweighs appearance. Sandblasting gives a finer, more even matt surface, often used for paving and walling where a softer effect is wanted. Both read lighter than polished on a light stone.

Natural Split and Tumbled

Natural split is the traditional finish for walling and setts, with a rough riven face and high grip. Tumbling softens edges and corners for a weathered appearance, used mainly for small-format paving and setts in landscape and period-style schemes. Other finishes produced include rough hammered, mushroom, axe-cut, bevelled and sawn.

Applications

• Memorials and headstones — the largest single application for G603 by value, covered above.
• Pedestrian paving and plaza stone — flamed paving and setts for squares, walkways and precincts.
• Kerbstones and road furniture — cut to national standards, supplied in container quantities.
• Cobblestone driveways and landscaping — including mesh-mounted setts for fast laying.
• Exterior wall cladding and facades — polished or honed small slabs.
• Interior flooring and stairs — polished and honed tiles.
• Countertops and worktops — mainly for commercial projects where a light grey is wanted.
• Window sills, thresholds and copings — cut to size.
• Steps, treads and risers — interior and exterior.

Sizes, Tolerances and Custom Fabrication

Most G603 orders are cut to size, and two specification details do most of the work in determining whether the delivered stone is usable.

Calibration. Calibrated material has uniform thickness; uncalibrated does not. For paving laid to a tight joint, calibration is close to essential — thickness variation shows up as lippage across the laid surface that no amount of careful laying will remove. Ask for the stated tolerance in millimetres, and confirm it applies to thickness as well as face dimensions.

Colour grading. This is the G603-specific risk. Because the stone is light, block-to-block and bundle-to-bundle variation is visible once laid. Good factories grade and blend across the run; poor ones do not, and the difference appears on site rather than in the yard. Specify that material be graded from consistent blocks, and ask for photographs of the actual bundles before the container is sealed.

Edge work. Sawn, bevelled, bullnosed, chamfered and eased edges are all produced. For kerbstones, the profile is the product — confirm it against a drawing rather than a description, because "kerbstone" covers a wide range of national profiles.

Packing and Container Loading

G603 is a mid-weight granite at roughly 2.63–2.68 g/cm³, slightly lighter than G684 basalt, which means marginally more area fits in a container at the same thickness. As with all dimension stone, the binding constraint is usually the destination's overland weight limit rather than the port.

How it is packed. Standard export packing is fumigated, seaworthy wooden crates or bundles, stamped for export. Cobblestones and small setts are typically supplied in ton bags or crates; tiles and slabs in wooden bundles with foam or PVC interleaving. For mesh-mounted paving, panels are stacked on pallets within crates to prevent the mesh being crushed.

Loading. Cut-to-size paving loads to roughly 300–500 m² per 20ft container at 20–30 mm thickness for a European or Middle Eastern destination, and materially less for North American destinations where overland weight rules bind. Kerbstones and cobblestones are dense in section, so they fill a container by weight well before volume — a kerbstone container is usually quoted by piece count or linear metre rather than by square metre.

Because the loading plan determines the landed cost per square metre as much as the ex-works price does, we quote a loading figure alongside every price.

The Lot-Consistency Question

Almost every supplier page about G603 describes it as uniform and consistent. Most of the time that is true. But it is worth being direct about the failure mode, because it is the one that costs importers money after the stone has left China.

Light-coloured granite shows colour variation more readily than dark granite. On a dark stone, a slightly lighter paver blends in. On a light stone, a slightly whiter paver against slightly greyer neighbours reads as a defect — particularly on a large flamed pavement where the light falls across it at a shallow angle.

This is not a property of G603; it is a property of light stone generally, and it is manageable. What makes the difference is factory discipline:

• Grading by block. Material should be graded at the source and blended across the production run, not pulled from whatever block is nearest.
• Photographs of actual bundles. A photograph of one hand-selected slab tells you nothing. A photograph of the packed bundles under daylight tells you most of what you need to know.
• A dry-lay or mock-up for large projects. For a plaza or a large paving contract, laying out a sample area from the actual production material is the only reliable confirmation.
• Consistent finish. Uneven flame treatment produces texture variation that reads as colour variation once installed, so finish consistency is part of colour consistency on flamed paving.

We photograph and record bundles at packing, and third-party pre-shipment inspection can be arranged on request. For a project where colour consistency is critical, say so at the enquiry stage rather than after the container has sailed.

Quality Control and Inspection

The checks that matter for G603, in the order they tend to cause problems:

1. Colour and grading. Bundle photographs in daylight; dry-lay for large contracts. This is the check most likely to prevent a claim.

2. Dimensional tolerance. Length, width, thickness and squareness against the stated figures, particularly for calibrated paving and kerbstones where profile accuracy is the product.

3. Surface and arris condition. Chipped edges, tool marks and inconsistent flame treatment, assessed on the packed material rather than on a sample.

4. Filler. Polished granite may carry epoxy filler in micro-fissures. This is normal trade practice and does not affect structural integrity, but it should be disclosed rather than discovered.

5. Test documentation. For projects specifying GB/T, ASTM or CE compliance, obtain the test report for the production lot, not a generic certificate for the material type.

Pricing

G603 sits in the economical tier of Chinese granites, and published reference points from the market give a sense of the range: mesh-mounted G603 paving has been quoted around US$15–30/m² ex-works with minimum orders from about 50 m², and some suppliers work to a one-container minimum. Memorial work is priced per piece — reference listings for finished Irish headstones run around US$100–200 each, carved angel memorials around US$300–500 each, and sub-bases around US$13 each, though these are indicative rather than quotations.

The factors that move a real quotation most are:

• Finish. Polished and honed add processing cost over sawn and flamed; carved and shaped memorial work is priced largely by labour.
• Calibration and tolerance. Tight-tolerance calibrated material costs more than uncalibrated.
• Colour grade. Consistent, well-graded material costs more than ungraded material — and is usually worth the difference.
• Order quantity and container fill. Quotations are normally against full-container quantities.
• Destination. The destination weight limit determines how much fits in the container, which changes the landed cost per square metre more than most buyers expect.
• Duty and tariff. Trade measures vary by destination and change over time. Confirm applicable rates with a customs broker for the specific entry rather than relying on any published list, including this one.

Ordering Process and Lead Times

1. Specification. Confirm the stone code, finish, thickness, tolerance, colour grade and — for kerbstones or coping — the profile drawing.
2. Samples. Physical samples are available. For G603 we particularly recommend approving the finish on a labelled sample, since the same stone in polished and flamed looks markedly different.
3. Quotation with loading plan. Price per unit alongside the container loading figure, so the landed cost is visible before commitment.
4. Pre-production approval. Bundle photographs, dry-lay for large paving contracts, or a prototype piece for custom memorial and kerb profiles.
5. Production. Typical production runs from around 10–15 days for standard stock items to 15–40 days for custom fabrication, depending on quantity and complexity.
6. Packing and inspection. Bundles photographed; third-party pre-shipment inspection can be arranged.
7. Shipping. Standard export terms include FOB Xiamen, CFR/CIF and EXW. Common payment terms in the trade are a deposit against production with the balance against a copy of the bill of lading, or a letter of credit at sight; terms are confirmed per order.
8. Documentation. Commercial invoice, packing list, bill of lading and certificate of origin, with fumigation documentation accompanying the packing.

Frequently Asked Questions

What is G603 granite used for?

Its two largest uses are memorial work — headstones, monuments and inscription slabs — and paving and kerbstone work. It is also used for exterior cladding, interior flooring, steps, window sills and countertops. Its light grey tone and fine speckle make it a common choice wherever a neutral, weather-resistant stone is wanted.

Is G603 the same as G3503?

G3503 is the newer four-digit code for the material commonly traded as G603. They refer to the same granite, but because codes are trade identifiers rather than material certificates, confirm with the supplier that the quarry and colour grade match what you specified before comparing prices.

What is the difference between G603 and G654?

They sit at opposite ends of the same sesame-pattern family: G603 is the light grey (芝麻白, sesame white) and G654 is the dark grey (芝麻灰 or 芝麻黑). G603 is generally the less expensive of the two. The practical difference for buyers is that G603, being lighter, shows colour variation more readily — so lot grading matters more.

What lettering colour works best on a G603 headstone?

Black gives the strongest contrast and reads most clearly from a distance, which is why it is the traditional choice. Gold leaf also works well. White or cream lettering has poor contrast against light grey and is difficult to read at any real distance, even though it photographs acceptably.

Does G603 need sealing?

Sealing is not strictly necessary for granite, given its low water absorption, but occasional treatment helps maintain the polish and limits algae and staining on a light-coloured surface. Where G603 is used outdoors, particularly in damp or shaded conditions, a penetrating sealer is a reasonable precaution.

How much G603 fits in a container?

Cut-to-size paving at 20–30 mm loads to roughly 300–500 m² per 20ft container for European and Middle Eastern destinations, less where North American overland weight limits apply. Kerbstones and cobblestones are dense in section and fill a container by weight well before volume, so they are usually quoted by piece or linear metre. The exact figure is confirmed with the quotation.

Why does G603 sometimes look patchy after installation?

Because it is a light stone, block-to-block colour variation that would be invisible on a dark granite becomes visible once laid. This is a grading issue rather than a materials issue. Bundle photographs before shipment, and a dry-lay for large contracts, are the practical controls.

Can G603 be used for exterior paving in freezing climates?

Yes. G603 is frost-resistant and its water absorption sits around 0.30–0.33%, comfortably inside the ≤0.40% requirement of GB/T 9966.3-2020. Correct installation — adequate drainage, appropriate bedding and movement joints — matters as much as the stone itself in freeze-thaw conditions.

Are G603 and Bianco Sardo the same stone?

No. G603 is a Chinese granite and Bianco Sardo is an Italian granite from Sardinia. They are similar in appearance — light grey with fine dark speckle — and G603 is often described as a close visual alternative at a lower price. They are different materials from different quarries.