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Who We Are

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Our Story

The creation of the ONTOO fine jewellery line, is a matter of heart and a project of passion by both Hatice Sagmanli and Martina Baeriswyl-Holzach. Turkish born Hatice Sagmanli, a renowned and accomplished jewellery designer and Argentine-Swiss Martina Baeriswyl-Holzach, a successful promotor and agent of a range of luxury goods for the Swiss market - together they form “The perfect match” and their combined skill sets are now united in the design and creation of the ONTOO jewellery collections. 

Designed in Switzerland and crafted by skilled artisans in Turkey, each piece of jewellery is unique and has been masterfully created with the customer in mind. ONTOO’s design philosophy is focussed on creative and bold expression, resulting in strikingly beautiful and elegant pieces. 


We want our clients to be able to play around with the collection, adding and combining all different parts. The versatility of the ONTOO collection allows for combining with existing personal jewellery, for those who enjoy individuality and style. Designs are created in rose gold, while yellow gold and white gold are available.
— Martina and Hatice