About 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.
Our Mission
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.
Our Vision
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 18k 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 + TO — jewellery you can always build upon, as unique and dynamic as the woman who wears it.
Join the ONTOO movement
Our Collections
jewellery: From the versatile Infinity Collection to custom-designed, one-of-a-kind pieces, ONTOO jewelry is crafted for everyday elegance and lifelong enjoyment.
“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
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.