MARTINA BAERISWYL-HOLZACH
A life shaped by curiosity, culture and gemstones.
I was born and raised in Argentina, and I am proudly Argentine.
Growing up in Buenos Aires, our home was a mix of cultures and languages. But one of my strongest childhood memories is of my mother's enormous collection of minerals and gemstones.
My sister and I were allowed to touch them, play with them and discover their different colours and qualities. Without knowing it at the time, my fascination with stones had already begun.
It started long before ONTOO.
“My mother had an enormous collection of stones at home. We played with them as children.”
Martina Baeriswyl-Holzach
From Buenos Aires to ONTOO.
THE JOURNEY TO JEWELLERY
“Eventually, the stones found their way back into my life.”
Learning jewellery from the inside
My career eventually brought me into the world of luxury, working with houses including Gucci and Dior, across fashion, watches and jewellery.
I later spent ten years working with an Italian fine jewellery house and directly with private clients and collectors. It was here that the stones I had known since childhood became part of my professional world too.
I learnt about craftsmanship, quality and value, but also something equally important: how deeply personal jewellery can be.
ON+TOO
The name says it all.
"ON" represents the jewellery you already own. "TOO" is the next piece you choose to add.
ONTOO was created with the belief that a jewellery collection should evolve with you—growing over time through meaningful pieces chosen to celebrate life's moments.
Because the finest collections are never finished. They are simply added to.
From the Office to the Opera
Jewellery for every part of your life.
Opera has always been one of Martina's great passions. For years, she would often go directly from work to an evening performance.
She wanted real jewellery that could move just as easily between those worlds. Beautiful enough for the evening, yet effortless enough to wear throughout the day.
That idea became part of ONTOO.
Jewellery made for the way women actually live.
I created ONTOO around a simple idea: fine jewellery should adapt to your life, not the other way around.
Real gold. Genuine gemstones. Pieces that can be worn every day, combined with what you already own and made personal to you.
REAL
Solid 14k gold and genuine gemstones. Fine jewellery made with real materials and designed to be worn every day.
PERSONALISABLE
Choose different gemstones and shades of gold to create a piece that reflects your style, preferences and personality.
TRANSFORMABLE
Add-Ons transform selected pieces in seconds, taking your jewellery effortlessly from day to evening.
MADE TO MIX
Different stones, shades of gold and collections are designed to work together, and with the jewellery you already own.
Perhaps there is something Argentine in ONTOO too.
Growing up in Buenos Aires, dressing for an evening out was part of the pleasure. Jewellery was something to enjoy and wear.
Zurich introduced another kind of elegance into my life: quieter, understated and effortless.
ONTOO brings those two worlds together.
Today, I design ONTOO in Zurich, drawing on everything I have learned throughout my life and career.
But whenever I discover a beautiful gemstone, I still have the same curiosity I had as a little girl looking through my mother's collection.
She gave me that fascination without either of us knowing where it would eventually lead:
ONTOO
Collections
Iconic Collection
Infinity Collection
Flower Collection
Clover Collection
Leather Collection
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A stunning 14k rose gold pendant featuring a 0.80 ct pink tourmaline accented by 1 ct of pavé diamonds at the centre. Comes with a handmade 14k rose gold link chain, 47 cm in length — elegant and timeless.
This piece is fully customisable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMISE!
Connect with our team and make your jewellery dreams come true!
Large Infinity Hoop Earrings. Crafted in 14k rose gold with 22 oval-cut London Topaz gemstones (1.60 ct total), designed for those who want presence without weight.
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!
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 customisable 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 14 and 18 K 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 + TOO — jewellery you can always build upon, as unique and dynamic as the woman who wears it.
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 customisable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMISE!
Connect with our team and make your jewellery dreams come true!
A refined and elegant 14K white gold choker featuring a large rimmed clover fully encrusted with sparkling diamond pavé. Crafted with 6 carats of VS and SI quality diamonds, this piece radiates brilliance while maintaining a sense of modern sophistication.
Designed to sit gracefully along the collarbone, the choker features an adjustable zip closure at the back, ensuring both comfort and a perfect fit. Its timeless elegance makes it a statement of everyday luxury that transitions effortlessly from day to evening.
This piece is fully customisable, choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMISE!
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 customisable — choose your preferred gold finish, gemstone, or add detachable elements to make it uniquely yours.
Click here to CUSTOMISE!
Connect with our team and make your jewellery dreams come true!
Contact us.
0041 76 445 49 94
contact@ontoo.ch