Natural Stone Buying Guide — What to Consider Before You Purchase

Start with the application, not the stone

Most disappointing stone purchases are not bad stone — they are the right stone in the wrong place. Before you fall for a slab, pin down where it is going and what it has to survive:

• Interior or exterior? Outdoors, frost, UV and de-icing salts rule out some stones and finishes.
• Floor, wall or worktop? Floors need abrasion and slip resistance; worktops need stain and etch resistance; walls are the most forgiving.
• Wet or dry? Showers, pool surrounds and kitchens punish porous stones and polished finishes.
• Traffic and use. A hotel lobby and a private bathroom are different engineering problems even with the same stone.

Know the families

• Granite — hard, dense and low-porosity. The workhorse for kitchens, paving and heavy-traffic floors.
• Marble — softer and calcite-based, so it scratches and etches with acids (lemon, wine, vinegar). Unmatched beauty; accept the patina or choose a honed finish.
• Quartzite — a metamorphosed sandstone that can look like marble but is far harder. Beware of soft "quartzites" that are really dolomitic marble; ask for test data.
• Limestone and travertine — warm, calm and widely used for floors and cladding. Porosity and density vary a lot; check the numbers for your use.
• Slate and sandstone — naturally textured and slip-resistant; popular for exteriors and roofing.

Our marble vs granite vs quartzite explainer goes deeper on the differences.

Ask for the numbers

A reputable supplier can provide test data for the properties that matter to your application. The key ones are water absorption, density, flexural strength, abrasion resistance, and — for exteriors — frost resistance. For floors, ask for slip-resistance values for the finish you are buying, not the polished sample on the table. In Europe these come from EN test methods and appear in the Declaration of Performance; elsewhere ASTM methods are common. Either way, no data is a warning sign.

Choose the finish for the job

• Polished — maximum colour and depth, but more slippery when wet and shows etching on marble.
• Honed — matte and calm; hides wear and etching better, good for floors and marble worktops.
• Leathered or brushed — tactile and forgiving of fingerprints; increasingly popular for kitchens.
• Flamed, bush-hammered or sandblasted — rough, slip-resistant exterior finishes, mainly for granite.

See stone finishes explained for a full comparison.

Select the actual material

Natural stone varies block to block. A small sample shows colour, not the pattern across a room. For anything visible, see — in person or by high-resolution photos of the real lot — the slabs you will receive, ideally all cut from the same block and numbered in sequence. For feature walls, ask about bookmatching. Our guide on how to read a slab explains what resin fill, mesh backing and veining tell you.

Get thickness and quantity right

• Common slab thicknesses are 20 mm and 30 mm; the right choice depends on span, overhang and fixing. See our thickness guide.
• Allow for waste: 10–15% is a sensible planning figure for tiles and simple layouts, more for complex cuts or pattern matching.
• Order the full quantity at once. A later top-up may come from a different block and never match.

Understand the price

The price per square metre depends on the stone's rarity, block yield, thickness, finish, slab size and grade — and then on freight, duties and fabrication. Compare quotes on the same basis: same thickness, finish, grade and Incoterm. Our price guide breaks this down.

Check the supplier, not just the stone

• Confirm the company is registered and has a verifiable address and track record.
• Ask for references or recent project photos, and for export documentation if you are importing.
• Agree packing — A-frames or crates, with heat-treated (ISPM 15) timber for international shipping.
• For larger orders, arrange an independent pre-shipment inspection. See how to verify quality before buying in bulk.
• Use payment terms that match the risk — never 100% upfront with a new supplier.

A one-page checklist

• Application defined: location, use, traffic, exposure.
• Stone family and specific stone chosen, with test data.
• Finish chosen for the use, with slip data for floors.
• Actual slabs or lot approved; same block where it matters.
• Thickness, sizes and quantity (with waste) confirmed.
• Quotes compared like-for-like, including freight and duty.
• Supplier verified; packing, inspection and payment terms agreed.

On LithoPrime you can compare verified vendors, review their specifications and certifications, and send one structured quote request to a shortlist — the fastest way to turn this checklist into comparable offers.

Photos: Kitchen countertop installation & custom stone fitting by Donovan Nimmo, CC0, via Wikimedia Commons; Granite slab up close by Tomwsulcer, CC0, via Wikimedia Commons.