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
Our Vision
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.
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 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.
Join the ONTOO movement
Collections
Iconic Collection
Infinity Collection
Flower Collection
Clover Collection
“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
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!
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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!
