Italy · Marble

Portoro

also known as Portoro Gold, Nero Portoro

A deep black marble crossed by brilliant gold veining, one of the most precious Italian marbles. Reserved for jewel-box interiors, bars and feature inlays.

Origin: Portovenere, La Spezia (Liguria), Liguria, Italy
Stone type: Marble (ASTM C503 (marble))
Density: 2.7 g/cm³
Look: black and gold, dramatic, art-deco
Finishes: polished
Formats: slab, tile, cut-to-size
Exterior use: Best specified for interiors
Est. yield / waste: ~20% indicative (gold veining rewards careful matching, raising offcut)
US import (HTS): 6802.91.05.00 (marble, worked)

Type-level physical facts shown. Per-lot lab values (absorption, flexural strength) confirmed at quotation.

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Produced by Ligurian Black & Gold Group · Portovenere, Liguria

Available now

Verified stock · Verona network

65slabs in stock

3blocks

219 × 143 cmaverage slab

Reserve slabs Enquire a block

Portoro slab in stock — 288 × 145 cm · 2 cm · in stock, Verona

Stock moves; figures indicative and confirmed at enquiry. Blocks available to order for cut-to-size and book-matched runs.

Origin & quarry

Nero Portoro is the black-and-gold marble of Portovenere on the Ligurian coast — a small, historic source. Its dramatic gold veining over a deep black ground has made it a luxury and Art Deco signature.

Geology. Metamorphic dark limestone/marble; deep black ground with gold and white calcite veining (the gold from iron-bearing calcite).

Where it works

Specify with confidence

Statement vanity tops and islands
Feature walls and bar fronts
Reception desks and joinery inlay
Bespoke furniture tops

Use with care

Acid- and scratch-sensitive — polished black shows everything; seal and treat as a feature surface
Interior only; not for floors in high traffic

Verified sources

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Portovenere quarry group

Quarry-direct · Portovenere, Liguria · Italy

Lithos‑verified 5/5

Quarry-direct or verified processor
Physical samples available
Technical specs documented
Photos verified at source
Export-ready for US trade

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Reference projects

Hôtel de Paris Monte-Carlo

Grand hotel · Monte-Carlo, Monaco · 1864 (restored 2019)

Italian Nero Portoro used in feature surfaces including the bar and private dining rooms, valued for the contrast with gold and cream interiors.

Good to know

Why is Portoro expensive?

It comes from a small, historic source in Liguria, the gold veining must be matched across pieces, and demand for genuine Italian black-and-gold marble is high. Beware cheaper look-alikes sold under the name.

Where should Portoro be used?

As a feature: vanity tops, bar fronts, reception desks and inlay. It is a decorative marble, not a hard-wearing floor stone.

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