The Obsidian Forum: Lighting Black Marble Without Losing It

An international interior architecture practice commissioned us for The Obsidian Forum, a high-end corporate headquarters in Riyadh's King Abdullah Financial District. The brief was a definitive digital twin of the interior before the final fit-out, the kind that lets a client de-risk material procurement, sign off complex spatial transitions, and capture institutional tenants early.

This is core workplace CGI for us. What set it apart was the material the whole scheme is built on: dark, polished nero marquina marble, everywhere.

Dark marble is the opposite problem to white

Most premium offices lean on pale stone, where the fight is stopping it blowing out. The Obsidian Forum flips that. Book-matched black marble on the reception wall, dark stone underfoot, against open-grain oak and floor-to-ceiling glazing.

Dark polished marble is the hardest stone to render well. Push the lighting and it goes to a flat mirror that reflects the ceiling and nothing else. Pull back and it crushes to a dead black hole with no veining and no depth. The veining is the entire reason you specify nero marquina, so losing it means losing the point. There's a narrow band in between where the stone reads as deep, lit and expensive, and finding it is most of the job.

We built the space from CAD and DWG data, then calibrated physics-based shaders for each surface: the book-matched black marble, the brushed brass inlay trims, the light herringbone timber floor, the tactile bouclé upholstery. The lighting went in as a layered scheme, bright natural daylight balanced against indirect LED coves, architectural downlights and sculptural feature pendants. I spent the bulk of the grade keeping that black marble in the lit band, because everything else in the room is judged against whether the hero material looks real.

The spaces

Reception is the statement: a monolithic dark marble desk against a book-matched marble wall, grounded by light herringbone oak floors and curved plaster ceiling profiles, so the dark stone has warmth around it rather than more darkness. Boardrooms and meeting suites sit behind minimal black-framed acoustic glass, with timber-topped tables and integrated media. Collaboration lounges and hot-desking zones bring the temperature down with perimeter planters, high-back focus booths and warm woods. An executive pantry and social hub rounds it off in dark cabinetry, stone counters and mid-century timber stools.

A view I'll commit to: the design's smartest move is the herringbone oak floor under all that black marble. Without it the reception would read as a mausoleum. With it, the dark stone looks intentional and rich. Rendering that contrast faithfully was where the warmth came from.

The honest limit

I can tell you we made the materials sit together and the space read as serious money handled with restraint. I won't claim to know how a Riyadh institution chooses its HQ or what tipped a tenant's decision. We did the visualisation; the market read stayed with the client and the practice.

The result

The renders gave the practice and the developers an asset that removed the spatial ambiguity from an expensive, material-led scheme. Once stakeholders could see how the dark stone, brass and timber would harmonise under real light, procurement could commit to imported finishes, sign-off moved faster, and the project went to construction with confidence.