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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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.

Related stone

photo pending · verified source

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