Sen Jewelry
A Brand Born from Dreams
Sen Jewelry is an exclusive Polish jewelry brand founded in 2023 by Marlena Masiejczyk — a designer and certified jewelry expert with international artistic and fashion experience. Sen was created from the idea of crafting jewelry that goes beyond form; pieces that become personal stories, emotions, and symbols of inner strength. Each design is handcrafted, forming a subtle fusion of art, artisanal precision, and a philosophy of beauty rooted in the experiences of the founder and her clients.
The brand collaborates exclusively with the finest Polish goldsmiths, creating short, unique series and bespoke pieces based on a distinctive personalization methodology and in‑depth client profiling. At the heart of this process lies expert, one‑on‑one guidance offered through the Jewelry Concierge service.
Sen celebrates feminine individuality, intuition, and emotional depth, offering jewelry that not only adorns but becomes a talisman of life’s meaningful moments. It is luxury immersed in authenticity, carrying personal significance.
About Me
My name is Marlena Masiejczyk, and I am the founder and Creative Director of Sen Jewelry. I am a jewelry designer and a certified expert of the GIA and HRD Institutes in Antwerp, with over 20 years of experience in the international world of fashion and design. I have had the pleasure of working with icons of haute couture such as Louis Vuitton, Valentino, Fendi, Dior, and Ralph Lauren, as well as for prestigious magazines including ELLE, Cosmopolitan, Women’s Health, and Glamour.
The aesthetic of my work is shaped by the richness of experiences gathered in New York, London, Milan, and across Asia. I combine gemstone expertise, intuitive design, and emotional storytelling to create jewelry with exceptional character and artistic depth.
My Journey
My passion for jewelry was born in childhood. As a little girl, I loved exploring jewelry boxes in search of sparkling treasures that I admired and tried on for hours. From school trips to museums, through modeling projects, to my first encounters with gemstones — jewelry has always been the fulfillment of my dreams.
After years in the fashion and modeling world, the moment came to close that chapter and fully devote myself to my childhood dream: creating jewelry. I moved to Indonesia, where I began working with one of the most prestigious jewelry companies.
There, I refined my design skills and deepened my knowledge of production, diamonds, and natural gemstones. During this time, I earned my certification from the Gemological Institute of America (GIA). It was there that the idea for Sen was born — jewelry filled with emotion, connecting my passion, personal stories, experience, and artistic imagination.
After six years of intensive work in the Asian jewelry industry, I returned to Poland. I completed the School of Goldsmithing in Warsaw and later obtained the Diamond Grader Certificate from the renowned HRD laboratory in Antwerp.
Born from Memories, Inspired by Stories
Today, Sen Jewelry creates luxurious, emotion‑driven designs inspired by personal narratives, nature, and art. Jewelry that highlights your uniqueness and allows you to feel extraordinary every day.
Your Story. Your Dream.
Thank you for being with us • Marlena Masiejczyk
