Applications

• Interior walls for halls, lobbies, TV rooms, and living areas

• Columns, balustrades, sculptures, fountains, and fireplaces

• Flooring for luxury residential and commercial units

• Staircases and interior risers

• Surface cladding

• Countertops

• Decorative and furniture elements

• Various artistic and architectural details

Product Availability at Karimi Stone:

Supplier ✔ | Exporter ✔ | Manufacturer ✔ | Quarry Owner ✘

General Description:

Pietra Grey Marble (Lashotor) is one of Iran’s most luxurious dark marbles. It features a deep grey background with fine white veins that vary in intensity from block to block. In lower grades, faint halos—commonly known as “Black Stein”—may appear.

Pietra Grey is internationally recognized and widely used in high-end interior design. After processing, the stone shifts to a charcoal-grey shade with sharper white veins, making it a preferred material for luxury flooring, wall cladding, staircases, countertops, bathrooms, and upscale interiors.

Technical Appearance & Classification

This marble is categorized primarily by color tone, vein structure, and finish type.

Technically, Pietra Grey is a dense calcitic marble, with color variations ranging from light grey to deep charcoal depending on the quarry layer.

Important Notes:

• Pietra Grey is ideal for book-matched and four-matched (4-match) slab layouts.

• In Middle Eastern markets (e.g., Oman, Bahrain), it is also known as Armani Grey.

• Suitable for both modern and classic interior designs.

• Combines beautifully with white marbles such as Aligoodarz, Scato, Bianco, Neyriz, and Ghorveh, enhancing the beauty of any space.

Finishing Options

Pietra Grey Marble supports a wide range of finishes:

• Honed – matte and smooth, ideal for interior walls and floors

• Polished – glossy and reflective, suitable for luxury settings

• Leathered (Brushed) – textured and modern for feature walls

• Sandblasted – slip-resistant for specific applications

• Bush-Hammered – for rustic or outdoor textures

Because it has distinctive veins and tonal variations, face-matching and sorting before installation is essential.

Bush-Hammered Pietra Grey

Two methods are available:

·         Hand hammering

·         Machine Bush-Hammering

Notes: The finish is categorized as heavy-hammered or light-hammered, based on project requirements.

This is one of the oldest processing styles for Pietra Grey in the Iranian market.

Stone Properties

• Appearance: Dark grey with delicate white veins; polished finish adds a luxurious character

• Water Absorption: Low to medium

• Compressive Strength: 100–250 MPa (high durability)

• Density: 2.6-2.7 g/cm³

• Abrasion Resistance: Medium to high

• Excellent polishability

• Contains natural calcite veins (sometimes referred to as “Black Stein”)

Sizes & Thickness

The Karimi Stone team provides full guidance for selecting the right slab or tile sizes according to project specifications.

Grading Guide for Pietra Grey Marble

Grade A:

• Highest quality

• Uniform background color

• No black stein or yellowish lines

• Thin, beautiful white veins

Grade B:

• High quality

• Small yellowish veins

• Up to 20% black stein

Grade C:

• Medium quality

• Visible defects, yellow patches, and strong black stein (up to 40%)

• More suitable for exterior applications

Price Factors

The price of Pietra Grey Marble depends on:

·         Color uniformity – most important factor

·         Processing quality – sawing, polishing, resin type, back reinforcement

·         Thickness – thicker slabs have higher value

·         Size – larger slabs and precise tiles cost more

·         Grade – Grade A (no Black Stein) is rare and expensive

Lashotor Quarry Information

The monthly extraction volume is approximately 3,000 tons, resulting in nearly 360,000 tons annually.

The quarry is located 35 km south of Isfahan in the Lashotor region.

Advantages of Pietra Grey Marble

• Strong global brand identity

• Wide range of finish options

• Mass production capability

• Ideal for interior architecture and luxury designs

• Over 100 years of quarrying history

Historical Background

Lashotor stone has been used in many historical monuments of Isfahan for more than 100 years, including:

– Si-o-Se Pol (33-Arch Bridge)

– Khaju Bridge

– Other iconic architectural structures

Cleaning & Maintenance

• Dust with a soft cloth or vacuum

• Use mild detergents for cleaning

• Apply a stone sealer to prevent stains and protect surface integrity

• Sealing is essential for long-term durability

Countertop Durability

With proper maintenance, Pietra Grey countertops can last up to 50 years.