Welcome to ONTOO
ONTOO creates timeless Swiss jewellery for you, a woman who knows who she is, values authenticity, and chooses beauty with meaning.
Designed for your cosmopolitan, confident, and independent spirit, each piece reflects your individuality. With customisable elements, every creation becomes uniquely yours, adapting to your style, your ambitions, and the way you live.
Crafted in gold and adorned with exceptional gemstones and diamonds, your ONTOO jewellery is more than something you wear. It is a reflection of your strength, your elegance, and the story you continue to write.
OUR COLLECTIONS
Iconic Collection
Infinity Collection
Flower Collection
Clover Collection
Leather Collection
About ONTOO
Every ONTOO creation begins with a simple belief. The jewellery you wear should feel as personal as the life you have built.
Inspired by founder Martina Baeriswyl-Holzach's lifelong passion for fine jewellery and fashion, ONTOO was born from a love of timeless beauty. Growing up in Argentina with Swiss roots, Martina discovered the magic of exceptional craftsmanship through her mother's collection of antique jewellery and precious gemstones.
Today, that passion lives on in every piece. Designed to accompany you through every chapter of life, ONTOO jewellery combines timeless elegance with modern versatility. Each creation is made to become part of your story, reflecting your individuality, your confidence, and the beauty of living life on your own terms.
Diamonds Addiction
The Medium Zip-Flower Diamond Necklace in white gold redefines modern elegance with its sleek, delicate zip-flower motif adorned in shimmering pavé diamonds. Designed with an adjustable length, this versatile piece effortlessly adds a touch of refined luxury and subtle sparkle to any ensemble.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Medium Gold Flower Diamond Pavé Earrings. Featuring a versatile design with both clip-on and foldable stud options, these medium-sized gold flower earrings are adorned with sparkling diamond pavé detailing—perfect for comfort and elegance in one.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Gold Mini Flower Diamond Pavé Necklace. A stunning and delicate piece that adds a touch of everyday luxury and elegance to any occasion. Perfectly designed to complement both casual and special moments.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
ONTOO’S Showroom
Experience the world of ONTOO in person at our Zurich showroom.
Take your time exploring our collections, discovering the beauty of exceptional craftsmanship, and trying on the pieces that feel like they were made just for you.
Whether you are searching for a timeless everyday companion, a meaningful gift, or a unique piece that reflects your individuality, we are here to guide you every step of the way. During your private appointment, you will receive personal advice on styling, customisation, and the selection of gemstones, ensuring every detail is perfectly yours.
We look forward to welcoming you and helping you find jewellery that you will treasure for a lifetime.
Mission
Your jewellery should be as unique as you are.
At ONTOO, every piece is designed to evolve with you. Our five signature collections offer endless possibilities to personalise your jewellery, allowing you to add gemstones, choose different finishes, or incorporate interchangeable elements that reflect your style and your story.
Whether you mark a special milestone or simply embrace a new chapter, your ONTOO jewellery grows with you, becoming a timeless expression of who you are.
Designed in Switzerland, crafted in Turkey.
Every ONTOO piece begins with a vision in Zurich, where founder Martina Baeriswyl-Holzach designs each creation with care and intention.
Crafted exclusively from solid gold, natural gemstones, and ethically sourced diamonds, your jewellery is made to be treasured for a lifetime. For more than a decade, Martina has partnered with a family-run atelier in Istanbul, where master artisans bring every design to life with exceptional craftsmanship and generations of expertise.
What makes ONTOO truly special is the thoughtful detail behind every piece. Elegant closures designed for modern living, customisable elements that evolve with your style, and timeless designs that move effortlessly from day to night.
This is jewellery created to become part of your story. Beautiful today, meaningful tomorrow, and treasured for years to come.
A stunning 14k rose gold pendant featuring a 0.80 ct pink tourmaline accented by 1 ct of pavé diamonds at the center. Comes with a handmade 14k rose gold link chain, 47 cm in length — elegant and timeless.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Crafted in 14k rose gold, the Infinity Ring features 12 oval-cut gemstones (1.60 ct total) set seamlessly around the band — available in Pink Tourmaline, Blue Topaz, or Citrine.
Designed for versatility and comfort, these rings are perfect for everyday wear. Stack them, pair them, or wear solo for a subtle yet refined statement. Elegant, timeless, and beautifully crafted to last.
Available in size 53/54. Custom sizing and gemstones available upon request. Customizable with white or yellow Gold, different Gemstones, Sapphires and Diamonds
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Contact us.
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![Ontoo luxury gold necklace with real gemstones, designed in Zurich. Perfect for layering.]()
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![Multiple gold and silver layered necklaces with flower and geometric shaped charms worn over a white satin blouse.]()
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![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.]()
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![Swiss handcrafted diamond flower ring for elegant women. Elegant flower-shaped diamond ring, handmade in Switzerland.
Unique diamond floral ring, luxury Swiss design.]()
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ABOUT ONTOO
At ONTOO, we believe your jewellery should be as individual as you are.
Created from a passion for exceptional design and craftsmanship, ONTOO offers fine jewellery that can be personalised to reflect your style, your story, and the moments that matter most. Every piece is designed to be worn effortlessly, whether you are dressing for everyday elegance or a special occasion.
Timeless, versatile, and made to evolve with you, ONTOO jewellery is the finishing touch that feels uniquely yours.
Discover the Iconic Collection
Little Gold Iconic Necklace with Diamond Pavé. A refined piece from the ONTOO Iconic Collection, this delicate gold necklace features a small, iconic cross-inspired pendant adorned with shimmering diamond pavé. Understated yet radiant, it's the perfect everyday luxury — elegant worn alone or layered with other favorites.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Versatile 14K rose gold earrings celebrate modern luxury with a refined twist on the classic Greek cross. The set features a brilliant diamond stud paired with two detachable Iconic elements—wear the stud alone for minimalist elegance, or layer the Iconics for a bold statement. Available in smooth rose gold or accented with pavé diamonds, this sophisticated design effortlessly balances symbolic beauty, contemporary style, and timeless craftsmanship.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!
Available in two exquisite sizes, the Iconic Pendant in 18K rose gold defines modern luxury. The medium pendant (19.87 mm) offers a refined pavé setting of champagne or TTLB diamonds, while the larger Iconic Big Pendant (25.30 mm) dazzles with approximately 90 TTLB diamonds totaling 2.33 ct. Both sizes embody timeless sophistication and can be personalized—click ‘Customize’ to request a chain and complete your perfect necklace.
This piece is fully customizable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMIZE!
Connect with our team and make your jewellery dreams come true!