Chinese Granite Types & Grades: G603, G654, G682 Explained

Why Chinese Granite Is Sold by Numbers

Walk into any Chinese stone quotation and you will meet G-numbers: G603, G654, G682, G684, G664. They are not quality grades like 'grade A' — they are the industry codes for individual quarries and their colors, assigned by province-level registration systems (the G prefix for granite, M for marble) and used by every factory and trader in the country. A buyer who quotes 'G603' to ten suppliers gets ten matching offers; a buyer who asks for 'white sesame granite' gets ten different stones. The code is the specification shorthand: it pins down the color, the origin, and usually the price band. This guide explains the codes you will actually see in export orders, how the big export grades compare, and the handful of words that turn a vague inquiry into a factory-ready order.

The Export Grades You Will Be Quoted

A small set of Chinese granites dominates world trade because they are consistent, workable and economical to ship. G603 (Sesame White / White Rustic) is the light grey-white speckled workhorse of paving and cladding — quarried in Fujian, low cost, huge availability. G654 (Sesame Black / Dark Grey) is the deep grey-black speckled standard for paving, kerbs and memorial work, with a distinctive even grain. G682 (Yellow Rustic / Golden Sand) is the warm golden-brown sandstone-toned granite favored for paving and steps where a warmer palette is wanted. G684 (Fuding Black) is a true near-black granite from Fujian used for monuments and wall cladding. G664 (Loyuan Red), G633 (China White), G687 and the reds (G682 variants aside) round out the palette. When a supplier offers 'New G603' or 'New G654', it means a replacement quarry opened after the original ran low — same family, slightly different tone; always ask for a photo of the actual block before committing.

What the Numbers Do NOT Tell You

The G-code fixes the color family, but the physical properties still vary by quarry, block and even slab position. Two G654 slabs can differ in grain density, shade and iron content. The properties that matter for your project are the tested numbers: water absorption (good granites stay under 0.3-0.4%, which matters for frost and stain resistance), compressive strength, flexural strength, and density. For paving in freeze climates, demand a water absorption test per batch. For monuments, look for tight grain and low absorption so lettering stays crisp. The code buys you the color; the test report buys you the performance — ask for both, and put the minimum values in your order.

Color, Price and the Hidden Cost of Matching

Within one G-code, tone shifts with the quarry block — early blocks differ from late blocks, and 'original' vs 'new' quarries differ visibly side by side. This is why large paving or cladding orders must state a single batch: one quarry, one block range, delivered together. Price follows color supply and demand, not quality — the light and dark greys (G603, G654) are the volume leaders and the cheapest, warm tones (G682) cost a step more, and the true blacks and rare whites sit at the top. The hidden cost in a matched-color job is wastage: expect to add 5-10% extra on top of cutting allowance when tone-matching across multiple pallets, and ask the factory to blend blocks before cutting so the shipment is even.

The Finish Changes the Same Stone

The same G603 block can be polished to a mirror for interior walls, flamed for a non-slip outdoor paver, bush-hammered for public paving, or sandblasted for tactile indicators — the finish is a separate line in the specification, not a property of the stone. For exterior paving, flamed or bush-hammered surfaces raise slip resistance and hide wear; for countertops and interior flooring, polished or honed is the norm. State finish, thickness, edge profile and format alongside the G-code, or the factory will default to its own house standard and your container will surprise you.

How to Order Chinese Granite Without Getting Burned

The order that closes cleanly reads like a test script. Line 1: the G-code plus the commercial name ('G654 Sesame Black, New G654'). Line 2: format and dimensions — slabs, tiles or cut-to-size, with thickness and tolerance. Line 3: finish (polished, flamed, honed, bush-hammered, sandblasted) and edge profile. Line 4: surface treatment (none, or sealed). Line 5: batch/block control — single quarry, one batch, blocks blended before cutting. Line 6: testing — water absorption and density reports per batch, plus flexural strength if structural. Line 7: approved sample — the factory sends a 30×30 cm sample of the actual block, you approve the tone in daylight, and the order is against that sample. Add the packing spec and the FOB/CFR term, and you have replaced 'cheap granite' with a specification a serious supplier can quote blind.

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