River Stone Vessel Sink 35"x15"x5.9" (88x37x15 cm) — RXXXL2509808

Riverstone Basalt Stone Vessel Sink — Hand-Carved Natural Volcanic Basalt — 88 x 37 x 15 cm (35 x 15 x 6 in) | RXXXL2509808

The RXXXL2509808 Riverstone vessel sink is a handcrafted piece, hand-carved from a single block of natural volcanic basalt quarried directly on the volcanic islands of Indonesia. Measuring 88 x 37 x 15 cm (35 x 15 x 6 in) and weighing 61 kg (134 lb), this XXXL (Triple Extra Large) countertop vessel sink is the largest and most imposing piece in the Riverstone collection — the definitive choice for presidential suites, high-end mansions and architectural projects that demand a natural sculpture of monumental proportions.

As a natural rock formed millions of years ago by the cooling of volcanic magma, every piece is absolutely one of a kind: the variations in tone, shape and veining guarantee that no one else in the world owns a sink exactly like yours. It is one of the natural stone sinks most often specified by architects and interior designers for high-end projects.

Dual Finish — Organic Exterior and Polished Interior

What sets Marmer Butik's Riverstone sinks apart is the contrast between two complementary finishes. The exterior preserves the raw, organic texture of the natural stone, keeping the wild, imposing look of the original basalt: every curve, every irregularity and every nuance of color tells the geological story of the rock. The interior goes through a high-precision polishing process, resulting in a surface that is smooth, satin-like and extremely easy to clean.

In the XXXL size, this combination of rustic character and functionality reaches its maximum visual impact: the piece transcends the idea of a sink and becomes a true monumental natural sculpture inside the bathroom. The inner bowl is so generous it resembles a small hand bath, offering an incomparable experience of use. Ideal for long vanity tops in presidential suites, monumental powder rooms and architectural projects where the sink is the absolute protagonist.

Volcanic Basalt — The Power of Fire and Time

Basalt is an extrusive igneous rock, formed by the rapid cooling of volcanic magma at the earth's surface, at temperatures above 1,100 °C (2,000 °F). This volcanic birth results in one of the densest and most resistant stones on the planet, with extremely low porosity and lifelong durability.

Unlike mass-produced ceramic, porcelain or resin sinks, basalt does not fade, flake or crack with changes in temperature, and it does not "age" badly. On the contrary, natural stone gains character with time, becoming a true heirloom in your home.

Who is this sink for?

• Presidential and luxury master suites: The XXXL size is the absolute protagonist, a monumental natural sculpture that turns the vanity top into a work of art.
• Monumental powder room: Impress visitors with a sink of unique proportions that becomes the absolute focal point and a talking point among your guests.
• Mansions and high-end homes: For clients who want absolute exclusivity, a collector's piece in dialogue with signature architecture.
• Luxury spas and 5-star resorts: Raises the standard of wellness spaces with a piece that conveys exclusivity and a deep connection with nature.
• Boutique hotels, presidential suites: Sets the bathrooms of the most exclusive suites apart with a handcrafted piece guests will never forget.
• Large-scale single vanity tops: Ideal for wide vanity tops where the XXXL sink takes center stage with majestic presence, making any other decorative element unnecessary.

Which faucet pairs with this XXXL sink?

For an XXXL sink in dark basalt, the faucet needs presence in proportion to the monumental scale of the piece:

• VERY tall high-arc faucet (recommended): Minimum height of 35 cm (14 in), in proportion to the sink's monumental size, with the right flow and no splashing.
• Wall-mounted faucet with a long spout: A sculptural look that frees the vanity top for the majestic presence of the sink.
• Two faucets side by side (special projects): For very wide vanity tops, consider installing two faucets at either end, for a symmetrical effect and double functionality.
• Ideal finishes for dark basalt: Aged bronze, matte black, brushed gold or copper, creating a sophisticated, timeless contrast with the dark tone.

Marmer Butik offers a complete line of bathroom fittings designed to pair with natural stone sinks. See compatible faucets

How to care for your Riverstone XXXL sink

• Daily cleaning: A soft cloth with water and mild soap; never use acids, bleach or abrasives.
• Dry after use: Avoid standing water to preserve the polished finish and prevent stains on the exterior.
• Annual sealing: Apply a sealer made for natural stone once a year.
• Avoid oily substances: Creams, oils and makeup can stain; wipe them off immediately.
• Do not use rough sponges: Choose soft cloths to avoid scratching the polished interior.
• Avoid strong impacts: Despite the high strength of basalt, heavy objects can cause cracks.

Marmer Butik tip: Apply a sealer formulated for natural stone once a year; it seals the micropores and keeps water gliding easily off the surface for decades.

Frequently asked questions about the Riverstone XXXL sink

Marmer Butik, based in Londrina, Brazil, offers an exclusive collection of natural stone vessel sinks, Riverstone (river stone) sinks, travertine marble sinks, natural stone bathtubs, solid wood furniture and handcrafted decor pieces imported from the volcanic islands of Indonesia. Every product is individually selected for its quality, beauty and exclusivity.

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