— notebook · works · process

an onyx fireplace.
from slab to site.

A commission from start to finish: a fireplace clad in Golden Cloud onyx and backlit. The slab was chosen, cut and dry-fitted in the workshop, transported and installed on site with the light behind it. This is the process you don’t see in the final photo.

words: Ray Ródenas, architect · october 2026

Golden Cloud onyx fireplace, unlit and backlit

01 · the slab.

It all starts with choosing the slab. Onyx is translucent: with light behind it, it changes completely, so you need to see it both ways before deciding. What looks like a warm ground of whites and ochres in daylight becomes an intense drawing of golden veins when backlit.

the chosen slab, in daylight
the chosen slab, in daylight
the same slab, backlit
the same slab, backlit

02 · the workshop.

In the workshop the pieces are cut and laid out so that the veining runs continuously across every face of the fireplace. Then the whole piece is assembled to check that everything fits before it leaves for site.

cutting the pieces
cutting the pieces
pieces laid out to match the veining
pieces laid out to match the veining
the piece assembled in the workshop
the piece assembled in the workshop

03 · transport.

Onyx is more delicate than marble. It travels upright on an A-frame, well secured, so it reaches the site exactly as it left the workshop.

upright on an A-frame
upright on an A-frame
loaded for site
loaded for site

04 · installation.

On site, the pieces are fixed leaving space behind them for the LED lighting, and the junctions with the firebox and the corners are resolved.

the lighting, behind the stone
the lighting, behind the stone
junction with the firebox
junction with the firebox
resolving the corner
resolving the corner
the large panel in place
the large panel in place
first light test, still on site
first light test, still on site

05 · finished.

Unlit, it is a stone piece with a warm pattern of ochres and whites. Lit, the light passes through the onyx and the veining becomes the centrepiece of the living room.

unlit
unlit
lit
lit
veining detail
veining detail

Work like this does not come out of a catalogue: you have to choose the slab, think through the layout and coordinate workshop, transport and site. That is exactly what we do.

onyx for your project?Fireplaces, bars, backlit panels, bathrooms or one-off pieces. We show you available slabs with and without light before you decide. Message us on WhatsApp →
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