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.