The Founder

Martina Baeriswyl, founder and visionary designer of ONTOO Jewellery & Fashion, combines a lifelong passion for fine jewellery and fashion with an intuitive understanding of what women truly want. Born and raised in Argentina with Swiss roots, Martina’s love for gemstones and design was sparked in childhood, inspired by her mother’s collection of vintage jewellery.

Her career began in the pharmaceutical industry, where she honed her skills in marketing and understanding customer needs. This expertise led her to collaborate with prestigious fashion houses such as Gucci and Dior, deepening her passion for luxury and elegance. Driven to create her own brand, Martina founded ONTOO to offer timeless, versatile, and beautifully crafted pieces that seamlessly fit into everyday life.

Martina Baeriswyl Holzach, the founder of ONTOO, brings Swiss precision and contemporary elegance to the world of luxury jewelry. From Zurich, she crafts timeless pieces that celebrate unique design and exceptional craftsmanship.

Our Mission

Our Vision

At ONTOO, our mission is to create jewellery and fashion that celebrates timeless elegance and effortless versatility. Every piece is designed to empower women, enhance their individual style, and seamlessly transition from day to night.

We believe luxury should not be reserved for special occasions—it should be lived, worn, and loved every day.

ONTOO redefines modern luxury by blending timeless design, comfort, and functionality. We envision a world where jewellery and fashion reflect the elegance of the past, yet fit effortlessly into today’s dynamic lifestyles—pieces that last a lifetime and tell a personal story.

Where it all started

The inspiration behind ONTOO began with a simple observation: many beautiful pieces of jewellery are too extravagant or impractical for daily life. Martina wanted to create luxury that is wearable—pieces that are elegant yet comfortable, playful yet timeless.

The name ONTOO reflects this philosophy: every woman already owns jewellery, and ONTOO is designed to add something truly valuable to what she already loves.

DNA

The ONTOO Woman

The ONTOO woman is cosmopolitan, confident, and effortlessly elegant. She values quality, individuality, and versatility — choosing jewellery that reflects her lifestyle and personal aesthetic. Whether navigating a busy workday, traveling the world, or enjoying an evening out, she wears her pieces like a second skin: refined, comfortable, and always true to herself. With ONTOO’s customizable designs, she can mix finishes, add elements, and create a collection that is uniquely her own.

Quality in Materials & Swiss Luxury Design

At the heart of ONTOO is a commitment to exceptional craftsmanship. Every piece is designed in Zurich by founder Martina Baeriswyl-Holzach and brought to life in collaboration with a family-run atelier in Istanbul, trusted for over a decade. Using 14 and 18 K white, yellow, or rose gold and hand-selected stones — from diamonds and topaz to amethyst, coral, garnet, and vibrant enamel — ONTOO blends Swiss precision with timeless luxury.

Customization with Purpose

ONTOO jewellery is designed to evolve with you. Each piece is thoughtfully created for versatility — add pendants, switch finishes, or combine elements to suit your mood or milestone. Earrings can transform with detachable drops, and long necklaces layer seamlessly or gain new accents over time. This philosophy defines our name: ON + TOO — jewellery you can always build upon, as unique and dynamic as the woman who wears it.

Join the ONTOO movement

Boat day vibes, elevated. Gliding through waves, escaping the crowd, and embracing the calm—wearing the Infinity Collection. Crafted to accompany every movement, every breeze, every moment on the water. #StTropez #SaintTropez #RivieraLifestyl
Stories told through hands. In every moment—whether reaching, creating, or simply being—ONTOO rings are there. Crafted to accompany life’s diverse settings with effortless grace and timeless design. Because true elegance is in the
Precision, focus, and quiet luxury. A day on the course with ONTOO—ready for an elegant performance. Lightweight, versatile, and crafted for movement, ONTOO pieces are made to keep up—on and off the green. #StTropez #SaintTropez #Rivier
ONTOO at the beach. @martinabaeriswyl , visionary and founder of ONTOO, shares the spirit behind the Infinity collection: “Our ‘Infinity’ collection encapsulates the essence of our brand: simplicity, longevity, and versatility. Eac
Beach day at @cybele.ramatuelle Two generations, same effortless sense of elegance. The Infinity Collection by ONTOO is designed to transcend time—worn by mother and daughter, each piece captures a shared language of femininity, strength, and
A day at the market in St. Tropez. Where vibrant colors meet effortless style. Wearing ONTOO’s Infinity Collection — crafted in rose gold with smooth, elongated ovals and delicate gemstones, designed for timeless elegance and everyday co
Date night at @airellespandei , romance meets craftsmanship. Wearing ONTOO’s Flower Collection—a delicate celebration of nature’s finest moments, crafted in rose gold and blooming with intricate details that capture feminine grace
Golfing day essentials: fresh air, focus, and a fitness check—with ONTOO. The Infinity Collection adds effortless elegance to your active moments, blending style and comfort on and off the course. Because elegance should never take a day off.
Welcome to the ONTOO Showroom. Located in Zurich, our showroom is accessible by appointment only — or during special open days like today. We opened our doors to showcase our timeless classics alongside a few one-of-a-kind pieces, just in time
Beach day at @loulourestaurants Wearing ONTOO’s Flower Collection—simple, elegant pieces designed to move effortlessly from beach, to inside the water and beyond. Understated yet distinctive, crafted with precision to complement every

Collections

Iconic Collection

Iconic Collection

Infinity Collection

Infinity Collection

Flower Collection

Flower Collection

Clover Collection

Clover Collection

“ONTOO is more than jewellery —it’s an invitation to celebrate your individuality, express your style with confidence, and embrace the beauty of simplicity. Our designs are made to be lived in, loved, and passed on, embodying the luxury of durability and timeless charm.”

— g

Close-up of a woman wearing a pink flower-shaped pendant necklace with pink stones, along with a white zippered clothing item.
Infinity Pendant Infinity Pendant Infinity Pendant Infinity Pendant
Infinity Pendant
from CHF 1,850.00
Infinity Ring Infinity Ring Infinity Ring Infinity Ring
Infinity Ring
CHF 1,890.00
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