Giallo Siena marble · Sovicille, Tuscany

The golden stone of Siena, at the price that scale makes possible.

Giallo Siena is a deep ochre-yellow marble with yellow veining and, in places, pale reddish patches. We buy it in volume and redistribute it: the purchasing scale is what makes the buying price work, and the buying price is what makes the selling price work.

See the sizes and formats Request a sample

Stock held: 3000 m²in our own warehouse
Thickness held: 15 mm · 18 mm · 20 mmstandard stock
Water absorption: 0.04% to 0.12% (published values across sources)EN 13755-08
Apparent density: 2710 kg/m³ (both published sources agree)EN 1936-07

Giallo Siena marble block — Giallo Siena marble — the golden ground with its yellow veining, photographed before cutting.

Our stock

What we hold, in our own warehouse

This material is held as slab, in three thicknesses, at sizes that are not one number but a band in two directions. A cut list is checked against the physical stock before it is priced, because a slab size is a band and not a fixed figure. What is actually on hand is on the <a href="/availability/">availability</a> page.

The 3,000 m² is a surface measure. How many slabs that represents depends on the dimensions of the pieces, so we do not quote a slab count against it.

Thickness held (mm)

15 mm · 18 mm · 20 mmBOSS, 2026-10-29 - our own stock statement

Slab length (mm)

1500 to 3200BOSS, 2026-10-29 - our own stock statement

Slab width (mm)

1200 to 2000BOSS, 2026-10-29 - our own stock statement

Stock area (m²)

3000BOSS, 2026-10-29 - our own stock statement

Weight per m²

15 mm: 40.65 kg/m² · 18 mm: 48.78 kg/m² · 20 mm: 54.20 kg/m² (nominal thickness, at the published 2710 kg/m³ apparent density)Derived from [S1] granitalsiena.com and [S6] StoneContact apparent density 2710 kg/m³ · calibration figure from [S16]

Thickness held: 15 mm, 18 mm and 20 mm.
Slab length: 1500 to 3200 mm. Slab width: 1200 to 2000 mm.
3,000 m² held in our own warehouse.
Stock confirmed against the physical warehouse at the time of enquiry.

Sizes and formats

Before the first order

The trade facts

These are the figures a customs broker asks for before the first container. They are stated here so that they are not a question at the last minute.

HS classification

The classification of natural stone follows how far the stone has been worked, not the name of the stone and not the colour. A slab that has been sawn into a rectangular shape and a slab that has been polished and cut to size are declared under different lines, and the invoice carries the line that matches the goods that actually ship.

2515120000

Marble cut by sawing or otherwise into blocks or slabs of a rectangular (including square) shape — merely cut.

6802919000

Other worked marble and alabaster articles — polished, ground, chamfered, profiled or carved, and cut-to-size pieces.

6802911000

Marble, travertine and alabaster stone carvings.

How it travels

Slabs travel on edge, never flat. Each face is separated so polished surfaces do not rub against each other, the bundle is compressed and banded at high tension, and the whole closes into a heat-treated wooden crate carrying the ISPM-15 mark. Cut-to-size tiles go into cartons on a pallet. Custom pieces are crated on their own.

Where it goes from

Dispatch is from our processing base in the Shunde and Yunfu cluster, and the loading port is chosen against the shipping line. Terms are quoted FOB or CIF against the destination. The stone is quarried in Tuscany and the processing is done in China — two separate places, and we do not merge them.

A sample before the order

A sample piece is cut from the stock itself, so what arrives is the material that would be supplied rather than a photograph of it. Sample cost and carriage are quoted with the request.

How we work

How the price is made

We buy across many orders rather than one, and we pass the result on. Volume purchased sets the acquisition price; the acquisition price sets the supply price. What reaches you is the outcome of aggregated demand, handled in one chain — sourcing, processing and delivery held together rather than passed down through intermediaries.

The chain

Volume purchased → better acquisition price → better supply price → the buyer

Collected procurement across many orders, not a single block

Deep resource integration: sourcing, processing and delivery in one chain

The price advantage comes from the purchase, and is visible in the supply

Worldwide redistribution to trade customers

Specification

What the published record says

These are the figures published for Giallo Siena marble, tested to EN standards. They are not a supplier's description of a block. The <a href="/glossary/">glossary</a> explains what each of them means, and the <a href="/calculator/">calculator</a> turns the density and the thickness into a weight.

Test values attributed to the marble laboratory of the Politecnico di Torino. Where a figure is ours rather than published, it is marked as ours.

Water absorption

0.04% to 0.12% (published values across sources)EN 13755-08 water absorption at atmospheric pressure

Apparent density

2710 kg/m³ (both published sources agree)EN 1936-07

Open porosity

0.30% (mean) · 0.30 (standard deviation)EN 1936-07

Flexural strength

21.2 to 25.3 MPa (published values across sources)EN 12372-07 flexural strength in natural conditions

After 48 frost cycles

20.1 MPa (mean) · 6.0 (standard deviation)EN 12371-03 flexural strength exposed to 48 frost cycles

Compressive strength

89.4 to 175 MPa (published values across sources)EN 1926-07 uniaxial compressive strength

Slip resistance, honed

43 dry · 16 wetEN 14231-04 slip resistance, honed finishing

Full technical record

Sovicille (SI), Siena, Tuscany, Italy

Sovicille, in the province of Siena

The quarries sit in Tuscany, in the province whose city gave the stone its name. This yellow marble was laid in the Duomo di Siena and carried to the Reggia di Caserta; in the Veneto it appears in the Basilica di San Marco and in Teatro La Fenice. It formed in the Jurassic as calcareous sediment, and the pressure and heat of that period are what turned it into the compact rock you cut today.

Rock

Worked stone

Applications

One stone, ten places it goes. Every application below is a different set of thicknesses, formats and finishes — not a different colour. Giallo Siena marble in use is photographed on the <a href="/gallery/">gallery</a> page, and how it is cut for each of these places is on the <a href="/process/">block to container</a> page.

Interior Flooring Honed for grip; laid on a substrate sized for the span. Stairs and Treads Thickness follows the rise, and the nosing profile is agreed before cutting. Kitchen Worktops Sealed for a wet working surface; 20 mm and 30 mm for unsupported spans. Bathrooms and Vanities Low absorption suits a humid room; honed where the floor is wet. Wall Cladding Any finish reads well vertically; 10 mm panels need mechanical fixing. Tables and Furniture Cut to size and edge-finished; matching across a set is decided at layout stage. Fireplaces and Mantels Riven or honed for the surround; the hearth takes heat separately. Terraces, Thresholds and Sills External use; bush-hammered or sawn for grip on the walking surface.

All applications

Finishes

What this stone takes, and what it does not

A finish is not a preference, it is a decision with consequences: what the surface takes, how it wears, and how it behaves when it is wet. Each one below carries a verdict - whether it is a standard order on this stone, whether it depends on the block, or whether it is not available here at all. The <a href="/edge-profiles/">edge profiles</a> we cut are drawn to section against the thickness of the material, and what to do to each finish once it is down is on the <a href="/care-maintenance/">care and maintenance</a> page.

The full finish dictionary

Polished

A standard order on this stone

A mirror surface. The golden ground reads deeper and the veining gains contrast; reflections of a lit room are the strongest on this stone.

Honed

A standard order on this stone

Soft sheen. The colour reads truer than polished and the texture stays quiet, which is why it suits large floors where gloss would be busy.

Leathered

Possible — ask first

A muted sheen with a tactile grain. It reads as a matte stone with depth rather than a flat one.

Sawed (diamond saw)

A standard order on this stone

A low, directional texture. Unpolished, uncoated, and completely honest about being raw stone.

Natural split (rock face)

A standard order on this stone

A rugged, cleft surface with the stone's own bedding visible.

Brushed

Possible — ask first

A fine directional scratch pattern with a satin sheen.

Tools

Four tools that answer the questions a buyer actually has: what the stone looks like in a room, what a particular slab looks like up close, what a given area needs in pieces and weight, and what is available.

Quantity and weight

A surface in, the pieces and the weight out, before you ask.

Open

Edge profiles

Twelve ways to finish an edge, each drawn to section against the thickness.

Open

Availability

What is on hand, by origin, thickness, finish and batch.

Open

The stone itself

The ground, the veining and the published figures, side by side.

Open

Questions

The eight questions that come up first when Giallo Siena marble is specified. The <a href="/care-maintenance/">care and maintenance</a> page answers the one that comes up after the order.

Where is Giallo Siena quarried?

What is its water absorption?

What thicknesses are available?

Can it take a flamed finish?

How is the price set?

Do you sell slabs directly to the public?

All questions

In the workshop

Giallo Siena marble, being worked

Three films from the workshop, shot on the day the photographs above were taken. The sawing film shows the block being opened; the second shows the finished surface under a hand; the third shows the slab travelling the polishing line. They are muted on purpose - the machinery is the subject.

A hand on the finished surface
The polished face of Giallo Siena marble, with the brown network running through the golden ground. The hand is the scale reference a photograph of a slab cannot give.
Open the film

The slab on the polishing line
The slab travelling the line after grinding, before the final polish. This is where the surface stops being sawn and starts being a finish.
Open the film

See the whole process, photographed

The golden stone of Siena, at the price that scale makes possible.

What we hold, in our own warehouse

The trade facts

HS classification

How it travels

Where it goes from

A sample before the order

How the price is made

Collected procurement across many orders, not a single block

Deep resource integration: sourcing, processing and delivery in one chain

The price advantage comes from the purchase, and is visible in the supply

Worldwide redistribution to trade customers

What the published record says

Sovicille, in the province of Siena

Rock

Worked stone

What this stone takes, and what it does not

Polished

Honed

Leathered

Sawed (diamond saw)

Natural split (rock face)

Brushed

Four tools that answer the questions a buyer actually has: what the stone looks like in a room, what a particular slab looks like up close, what a given area needs in pieces and weight, and what is available.

Quantity and weight

Edge profiles

Availability

The stone itself

The eight questions that come up first when <strong>Giallo Siena marble</strong> is specified. The <a href="/care-maintenance/">care and maintenance</a> page answers the one that comes up after the order.

Giallo Siena marble, being worked

The block being opened

A hand on the finished surface

The slab on the polishing line

Tell us the application, the size and the finish you need, and we will come back with what we can actually supply.