Four hidden variables behind price
1. Density
Denser stone is harder to quarry and cut and heavier to ship, but it resists chipping, staining and wear. Soft and dense versions of the same stone can sit side by side in a yard.
2. Grade
Premium grades have fewer holes and fissures, tighter size tolerance and more consistent color. Commercial grades are cheaper but need more sorting and cutting.
3. Thickness & format
3 cm pavers cost more than 1.2 cm tile; large formats and custom sizes cost more and need flatter bases. Gauged (calibrated) stone costs more but installs faster.
4. Finish
Tumbling, brushing, honing, flaming and filling are extra steps after cutting. They change grip, look and stain resistance, and price.
Strength ranges (why “limestone” alone tells you little)
| Stone | Typical compressive strength range | What it means |
|---|---|---|
| Limestone | Very wide: ~2,500 to 28,000+ PSI | Soft chalky to very dense; ask which you're buying |
| Travertine | ~4,000 to 12,000 PSI | Moderate; fine for patios and pool decks |
| Sandstone | Varies widely with cementing minerals | Quartzite-cemented is very hard; clay-cemented is soft |
| Basalt | ~14,500 to 40,000+ PSI | Very dense; driveway-tough |
General industry ranges for orientation only. Ask for a spec sheet (ASTM test data) for the specific product.
Finishes, decoded
| Finish | How it's made | Good for | Trade-off |
|---|---|---|---|
| Natural cleft | Split along natural layers | Walkways, pool surrounds | Uneven surface |
| Tumbled | Tumbled with grit in a drum | Pool decks, Old-World patios | Softer edges, more texture to clean |
| Honed | Ground smooth, matte | Covered patios, modern looks | Can be slick when wet; seal it |
| Brushed | Wire-brushed texture | All-round exterior | Slightly higher cost |
| Flamed / thermal | Torched so crystals pop | Basalt, granite, bluestone; pool decks | Rougher; traps dirt |
| Polished | Buffed to gloss | Indoors only | Slippery outdoors |
Questions to ask at the yard
- "Is this a dense, exterior-rated grade? Do you have spec data?"
- "What's the thickness and size tolerance? Is it gauged?"
- "Is this lot consistent with what will be delivered?"
- "Is it suitable for my pool coping (or driveway, or patio)? Any iron content concerns?"
- "What's the price per square foot including the pallet, delivery and overage?"
Frequently asked questions
What question should I ask at a stone yard?
Ask: ‘Is this a dense, exterior-rated grade of this stone, and what is it best suited for?’ Then tell them exactly where it's going (pool deck, patio, driveway, wall) so they can recommend the right grade and thickness.
What is compressive strength?
It's the crushing force a stone can take before failing, usually given in PSI. Higher numbers generally mean a denser, more durable stone. It's useful for comparing grades, especially for driveways and steps.
