Decorative onyx for interior design

At L.M.G. di Botton, we supply premium onyx slabs to interior designers, architects, and specialist fabricators across Italy and worldwide. With over six decades of experience in the natural stone industry, we combine a curated selection of rare and distinctive varieties with in-house processing to deliver onyx of exceptional quality — a statement material for luxury interiors where design is the priority.

Technical characteristics of onyx slabs

Onyx is a unique and highly decorative natural stone, prized for its vivid colour palette, striking veining, and translucency. It is formed through the slow deposition of calcium carbonate in cave systems, resulting in layered patterns and rich tonal variations that make every slab visually captivating. Technically, onyx is more delicate than other natural stones, but with the right treatment and placement, it becomes a powerful material for artistic and luxury applications.

Key technical features include:

  • Translucency: onyx is naturally semi-transparent, making it ideal for backlit applications that reveal its inner structure and veining.
  • Surface smoothness: when polished, it reaches a mirror-like finish that enhances depth and brilliance.
  • Moderate hardness: with a Mohs rating of 3–4, onyx requires careful handling and proper sealing to maintain its integrity.
  • Thermal sensitivity: best suited for interior environments where temperature variations are minimal.

Despite its delicate nature, onyx delivers unmatched aesthetic value when used thoughtfully and professionally, making it a favourite for high-end design projects.

Due to its bold appearance and light-transmitting properties, onyx is most often chosen for projects where design is meant to impress. It is commonly used in backlit wall panels and vertical applications such as reception desks, bar fronts, and feature walls—especially in hotels, luxury retail stores, and exclusive residences.

In bathrooms, onyx is suitable for vanities, countertops, and decorative elements that elevate the space. Onyx is increasingly popular in luxury furniture design, where it is applied to table surfaces, shelving, or integrated lighting features.

Why choose onyx over other materials

Onyx is unlike any other natural stone. Its ability to transmit light allows designers to play with illumination, transforming surfaces into focal points. No engineered or synthetic surface can replicate the depth, movement, or vibrancy found in genuine onyx slabs.

While it requires greater care than granite or quartzite, it rewards that attention with an unmatched emotional and visual response. Choosing onyx means choosing exclusivity: each slab is a one-of-a-kind composition of minerals and colours, ensuring that every project carries a unique identity.

For clients seeking decorative onyx for interior design or hospitality spaces that stand out, onyx delivers refinement that transcends trends.

Onyx slabs’ formats and finishes

We offer a curated selection of onyx stone slabs in various sizes and thicknesses, ideal for decorative applications that demand precision and impact. Standard thicknesses include 2 cm and 3 cm, with the possibility of cut-to-size production for bespoke architectural needs.

To adapt onyx to different aesthetic contexts, we provide the following finishes:

  • Polished: enhances the stone’s natural brightness and veining, ideal for vertical and low-contact surfaces.
  • Honed: a soft matte finish that reduces reflectivity while preserving detail.
  • Resin-treated: increases structural stability for demanding interior applications.

Each slab is carefully selected to meet the visual and technical expectations of designers and developers working on sophisticated, image-driven projects.