ONTOO is fine jewellery of the highest quality, designed by and made for the cosmopolitan, confident, and independent woman — a woman who knows craftsmanship, values authenticity, and leads a dynamic life.

Each piece is a reflection of her individuality, with customisable elements that adapt to her style and ambition, and the enduring brilliance of gold, gemstones, and diamonds that mirror her strength and elegance.

Discover the Leather Collection

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OUR COLLECTIONS

Iconic Collection

Iconic Collection

Infinity Collection

Infinity Collection

Flower Collection

Flower Collection

Clover Collection

Clover Collection

About ONTOO

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.

Born from Martina Baeriswyl-Holzach’s lifelong passion for fine jewellery and fashion, ONTOO blends timeless design with modern versatility. Raised in Argentina with Swiss roots, Martina was inspired by her mother’s collection of antique jewellery and gemstones — a love that grew into a vision for everyday luxury.

Every ONTOO piece reflects her belief that true elegance is effortless, versatile, and lived. From refined jewellery to sophisticated fashion, the brand celebrates individuality and a lifestyle of comfort and timeless beauty.

Diamonds Addiction

Zip-Flower Diamond Necklace Zip-Flower Diamond Necklace Zip-Flower Diamond Necklace Zip-Flower Diamond Necklace
Zip-Flower Diamond Necklace
Medium Gold Flower Diamond Earrings Medium Gold Flower Diamond Earrings Medium Gold Flower Diamond Earrings
Medium Gold Flower Diamond Earrings
Mini Flower Diamond Necklace Mini Flower Diamond Necklace Mini Flower Diamond Necklace Mini Flower Diamond Necklace
Mini Flower Diamond Necklace
A beige upholstered chair with a dark green textured fluffy pillow placed on it, positioned by a large window overlooking a scenic landscape of green trees, buildings, and distant hills under a cloudy sky.

ONTOO’S Showroom

Discover the world of ONTOO in person. Our Zurich showroom is where design meets craftsmanship — a welcoming space where you can explore the full range of collections, feel the quality of our materials, and try on pieces that speak to your personal style.

Whether you're looking for something timeless, customisable, or truly one-of-a-kind, we’re here to guide you through every detail. Private appointments are available to offer you a personalised experience and answer any questions you may have about customisation, stones, or styling.

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Mission

ONTOO celebrates personal expression through customisable fine jewellery — designed to evolve with you. Built around five core collections, each piece can be personalised by ‘adding on’ elements — more stones, different finishes, or interchangeable details — making every creation as unique as the person who wears it.

Designed in Switzerland, crafted in Turkey.

Every ONTOO piece is born in Zurich, where founder Martina Baeriswyl-Holzach designs each creation in her atelier. With a firm commitment to quality, Martina works exclusively with solid gold, natural gemstones, and ethically sourced diamonds — crafting fine jewellery that blends timeless luxury with contemporary flair.

For over a decade, Martina has collaborated with a trusted family-run atelier in Istanbul, Turkey. Masters of their craft for generations, this close-knit team brings ONTOO designs to life with expert craftsmanship and responsibly sourced materials.

What sets ONTOO apart is its thoughtful attention to detail: closures designed for the modern, cosmopolitan woman; modular elements for customisation; and a seamless balance between elegance and practicality. The result? Fine jewellery that’s as adaptable and sophisticated as the women who wear it.

A woman holding a bouquet of pink and yellow flowers, wearing jewelry including a gold necklace with a flower-shaped pendant, a gold bracelet with purple stones, and a gold ring, dressed in a white shirt and black fur coat.
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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  • A woman with red hair wearing jewelry, sitting outdoors on rocks, dressed in a black sleeveless top.

    Sell it.

  • Ontoo luxury gold necklace with real gemstones, designed in Zurich. Perfect for layering.

    New List Item

  • Multiple gold and silver layered necklaces with flower and geometric shaped charms worn over a white satin blouse.

    New List Item

  • Ontoo luxury diamond earrings designed as elegant floral motifs, handcrafted in Zurich. Perfect for special occasions or adding a touch of timeless sophistication to any outfit. Made with real diamonds and high-quality gold.

    New List Item

  • Swiss handcrafted diamond flower ring for elegant women. Elegant flower-shaped diamond ring, handmade in Switzerland. Unique diamond floral ring, luxury Swiss design.

    New List Item

ABOUT ONTOO

ONTOO Jewellery, a passion-born brand with a very distinct vision: to craft customizable jewellery. Tailored to the cosmopolitan woman and man, this unique brand delivers what they seek - that special piece that can be combined or coupled ontoo any outfit, ultimately completing it.

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Discover the Iconic Collection

Gold Diamond Iconic Necklace Gold Diamond Iconic Necklace Gold Diamond Iconic Necklace Gold Diamond Iconic Necklace
Gold Diamond Iconic Necklace
Gold Diamond Iconic Earrings Gold Diamond Iconic Earrings Gold Diamond Iconic Earrings Gold Diamond Iconic Earrings Gold Diamond Iconic Earrings
Gold Diamond Iconic Earrings
Iconic Pendant Iconic Pendant Iconic Pendant
Iconic Pendant

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
Golden hour at @senequier_sainttropez As the sun dips behind the yachts and the air turns velvet, ONTOO embraces the timeless charm of St. Tropez nights. The Infinity Collection sets the tone—crafted in rose gold, shaped into soft, elongated