Blue stone has been one of the most popular materials in Belgian construction for centuries. But when picking your terrace tiles or sills you soon come across two varieties: Belgian and Vietnamese bluestone. The price difference is significant, but what exactly do you get for your money? As a family business with more than 100 years of experience in natural stone we put the facts clearly on the table.
The main difference is in its geological composition. Belgian bluestone (also called ‘petit granit’) is a compact, non-porous limestone formed 345 million years ago in our Hainaut subsoil. Asian varieties have a different mineral composition with a higher dolomite (lime and magnesium) content and are therefore less adapted to our climate.
| Feature | Belgian blue stone | Vietnamese blue stone |
| Composition | Compact limestone, non-porous | Dolomite (lime + magnesium), more porous |
| Frost resistance | Excellent, resistant to Belgian climate | Much more sensitive |
| Color stability | Lasting deep blue with beautiful patina | May discolor brownish over time |
| Appearance | Crinoids (fossils), deep blue color | Oölites (white spots), rather grayish |
| Price level | Higher (local extraction, strict selection). Customization possible | Bearing (mass production, transportation). standard dimensions |
| Lifetime | For generations, proven for centuries | Perhaps shorter |
| Co2 Impact | Very low | Very high |
Belgian bluestone can be recognized by the crinoids: fossilized sea lilies visible as small white dots or lines. These are authentic signs of Belgian origin. Vietnamese stone, on the other hand, contains oölites: round, whitish chalk balls that can oxidize over time and form brown spots.
Tip: Dip a piece of stone in water for a long time. Do circles appear? Then it is not Belgian bluestone.
At Renier, we check every batch of natural stone for color consistency, structure and technical properties. Belgian blue stone is selected according to strict European standards. Asian varieties are often subject to less stringent criteria in their country of origin, so the quality may vary from one delivery to another.
When in doubt, always ask for a certificate of origin to. This document proves where the stone comes from and what quality controls have been carried out. Also see our technical specifications for more details.
Why does Vietnamese blue stone sometimes turn brown?
Chinese blue stone contains dolomite with iron-rich oolites. Oxidation can cause these whitish patches to turn brownish over time, especially with moisture and acid rain.
How much more expensive is Belgian blue stone?
Expect to pay about double the price of Vietnamese bluestone. This is due to the local extraction, strict selection and limited availability of Belgian bluestone. The placement itself is identical count on 65 to 90€/m2 placement depending on the difficulty and sizes.
Can I use Vietnamese blue stone for my patio?
Vietnamese varieties are more sensitive to our climate and are not recommended for intensive outdoor use.
How do I maintain bluestone?
Both variants require little maintenance. Regular mopping with water and neutral soap is sufficient. A impregnation treatment Provides additional protection against stains and moisture. View our maintenance tips for more information.
At Renier Natural Stone we have been helping contractors, architects and individuals choose the right brick for more than 100 years. Visit our new showroom in Aarschot or request a free quote. We are happy to show you the difference with your own eyes.
