River Stone Freestanding Bathtub 68"x46"x26" (172x116x65 cm) — BRS01

Volcanic Basalt Natural Stone Soaking Bathtub (Riverstone) — 172 x 116 x 65 cm (68 x 46 x 26 in) — For 2 People | BRS01

The BRS01 Riverstone Soaking Bathtub is a monolithic piece hand-carved from a single block of natural volcanic basalt, imported directly from the volcanic islands of Indonesia. With dimensions of 172 x 116 x 65 cm (68 x 46 x 26 in) and room for 2 people, this bathtub is a true sculpture of nature — formed as volcanic lava cooled over millions of years, then shaped by hand by skilled artisans in Bali and Java. Every piece carries unique, unrepeatable shapes, tones and textures, turning any high-end bathroom, master suite or spa space into a wellness retreat with organic, timeless design.

One of the volcanic basalt soaking bathtubs most coveted by architects and interior designers for biophilic projects, luxury spas and high-end homes — a piece with an organic sculptural presence that creates unique sensory experiences of connection with nature.

Volcanic basalt: the power of nature in your bathroom

Basalt is a highly resistant volcanic rock, formed by the rapid cooling of lava on contact with the atmosphere. Found widely across the islands of the Indonesian archipelago — one of the most volcanically active regions on the planet — this stone has exceptional density, superior resistance to impact and scratches, and a dark grey to black tone with natural nuances that vary from piece to piece.

Unlike ordinary fiberglass or acrylic bathtubs, a natural stone bathtub is virtually indestructible, withstanding the wear of time without losing its original beauty. The stone surface has a slightly porous texture that feels velvety to the touch, giving it an organic, authentic character impossible to reproduce in manufactured materials.

Heat retention and the bathing experience

One of the greatest advantages of a natural basalt stone bathtub is its extraordinary heat retention. The volcanic stone absorbs the temperature of the water and keeps it warm far longer than conventional acrylic or fiberglass tubs, giving you long, relaxing, therapeutic soaks without constantly reheating the water.

Its organic shape follows the natural curves of the body, and the generous dimensions leave ample room for a full soak for 2 people. The 1 1/4" drain opening is compatible with standard drain systems.

Basalt has low porosity and high natural strength. Slight variations in tone, differing textures and color nuances are part of the stone's volcanic nature — they attest to the authenticity and genuine origin of the rock. Unlike mass-produced acrylic, fiberglass or resin bathtubs, basalt does not fade, peel or crack with temperature changes, and it only gains character over time — making it a timeless investment and a true heirloom for your home.

Ideal Settings and Projects

• High-End Residential Bathrooms: Creates an atmosphere of organic luxury and warmth in the primary suite or bathing room, with the strength of volcanic stone.
• Spas and Resorts: Adds exclusivity and a unique sensory experience for guests, with a piece that is both natural and sophisticated.
• Boutique Hotel Suites: Turns a stay into a true private spa, setting the property apart with a piece that cannot be reproduced.
• Country Homes and Mountain Chalets: Complements rustic and biophilic design projects with a bathtub that echoes the natural landscape.
• Wellness and Meditation Spaces: The presence of natural volcanic stone creates a sense of connection with the earth, ideal for relaxation practices.
• Biophilic and Wabi-Sabi Projects: Basalt is the perfect stone for projects that celebrate organic beauty, natural texture and the authentic imperfection of raw materials.

Compatible mixers and faucets

Choosing the right bathtub mixer is essential for comfort and an aesthetic that lives up to this monumental piece:

• Freestanding floor-mounted tub filler (recommended): Rises from the floor beside the bathtub — the most sophisticated option and the one best suited to monumental soaking tubs like this one.
• Wall-mounted mixer with long spout: An excellent alternative when there is a wall nearby — a clean, sophisticated look.
• Mixer with flexible hand shower: Adds practical function for rinsing and cleaning.
• Ideal finishes for dark basalt: Matte black (a powerful monochrome look), copper (warmth that contrasts with the grey), brushed gold (dramatic luxury) or brushed stainless steel (contemporary industrial) — matte black and copper are especially recommended, as they complement the deep tone of the volcanic stone.

Marmer Butik offers a full line of bathroom fixtures designed to pair with natural stone bathtubs and sinks. See compatible faucets →

Bathtub care and maintenance

• Daily cleaning: Clean only with a damp cloth and mild soap — this prevents residue build-up without harming the basalt.
• Avoid harsh products: Do not use abrasive products, acids, chlorine or harsh detergents that could damage the stone surface.
• Annual sealing: Reapply a stone sealer made for natural stone every 12 months to protect against stains and liquid absorption.
• Dry after use: Avoid prolonged standing water to keep the finish always flawless.
• Watch out for oily substances: Bath oils, colored salts and pigmented products can stain the stone — clean immediately if contact occurs.

Installation and Logistics — IMPORTANT: Because it weighs approximately 1,200 kg (2,646 lb), installing this natural stone bathtub requires detailed advance planning. The floor structure must be reinforced as specified by a structural engineer to support the weight of the piece plus the water and the bathers. Getting the bathtub into the room must be planned around its dimensions and the delivery logistics — a forklift or crane truck is mandatory for unloading and positioning. The piece ships in a wooden crate or on a pallet by insured freight, and we guide you through the process. We recommend that installation be carried out by qualified professionals experienced with large natural stone pieces. Shipping is quoted individually (insured crated freight), and unloading at the delivery address is the customer's responsibility.

Frequently asked questions about the Riverstone basalt bathtub

Marmer Butik, based in Londrina, Brazil, offers an exclusive collection of Riverstone bathtubs in volcanic basalt, travertine marble bathtubs, natural stone bathtubs, Riverstone sinks, travertine marble sinks, pedestal sinks, petrified wood sinks, solid wood furniture and handcrafted decorative pieces, imported from the volcanic islands of Indonesia and made in our own atelier in Brazil. Every product is individually selected for its quality, beauty and exclusivity.

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