Welcome to ONTOO Jewellery
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.
OUR COLLECTIONS
Iconic Collection
Infinity Collection
Flower Collection
Clover Collection
About ONTOO
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.
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.
The 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.
Contact us.
contact@ontoo.ch
-
![Unique luxury rings, crafted from Enamel with unique flower design and precious stones.]()
Dream it.
-
![Unique outfit with denim and a simple white top. This outfit is completed by precious Enamel Jewellery.]()
Grow it.
-
![A woman with red hair wearing jewelry, sitting outdoors on rocks, dressed in a black sleeveless top.]()
Sell it.
-
![Close-up of a woman's neck and shoulder, wearing layered jewelry including a gold chain with a flower pendant and a gold choker with pink stones, in an outdoor setting with green foliage and a patio umbrella in the background.]()
New List Item
-
![Close-up of a woman's neck wearing a pink flower-shaped necklace with small pink and clear stones, above a white zip-up jacket.]()
New List Item
-
![Multiple gold and silver layered necklaces with flower and geometric shaped charms worn over a white satin blouse.]()
New List Item
ABOUT ONTOO
Introducing 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.
FAQs
-
All ONTOO pieces are crafted using 18k white, yellow, or rose gold. We work exclusively with real precious and semi-precious stones — including diamonds, topaz, amethyst, garnet, coral, and enamel — ensuring each piece reflects the highest standards of quality and craftsmanship.
-
Our designs are created in our Zurich atelier by founder Martina Baeriswyl-Holzach. Each piece is then handcrafted in Istanbul by a trusted family-run workshop with generations of experience in fine jewellery. Final quality control takes place in Zurich before pieces are shipped to clients worldwide.
-
We accept returns on non-customised items within 14 days of delivery, provided they are unworn and in original condition. Customised and bespoke pieces are non-returnable unless faulty. For more, visit our Returns & Exchanges page.
-
Visits to our Zurich showroom are available by appointment. You’ll be able to see the collections up close and explore customisation options with personal guidance. Contact us here to book your visit.
-
Absolutely. If you’d like to create a one-of-a-kind piece, we offer a bespoke design service. From engagement rings to meaningful gifts, we’ll work closely with you to bring your vision to life using the finest materials.
-
Yes — customisation is at the heart of ONTOO. Most pieces can be personalised: choose your preferred gold tone, add or remove stones, and create modular combinations such as adding pendants or layering chains. Our team is happy to guide you through the options to create your perfect piece.
-
We ship globally, directly from our headquarters in Zurich. Shipping fees and timelines vary based on destination and order value. For full details, please refer to our Shipping Policy.
-
Customised or made-to-order pieces typically take 2–5weeks to complete. We will keep you informed throughout the process and provide estimated delivery dates upon confirmation.
Join the ONTOO movement
