Collection: The story of Kastehelmi

Originally designed in 1964 and relaunched in 2010, Kastehelmi has become one of Iittala’s most recognisable glass collections. Its appeal lies in the balance between clarity and detail — simple forms brought to life through a surface that responds to light, movement and everyday use.

Kastehelmi’s defining feature was born out of practical thinking. During the pressed-glass production process, joint marks were often left behind — an unavoidable technical detail. Rather than hide them, the solution was to transform them into something expressive. Small glass droplets were added to the surface, radiating outward in precise rings.

What started as a technical fix became a design signature. The droplets enhance the optical qualities of Iittala’s glass, refracting light and giving each piece its unmistakable character. Made at the Iittala Glass Factory in Finland, Kastehelmi demonstrates how thoughtful design can elevate function into beauty — without losing its everyday purpose.

Designed by Oiva Toikka, Kastehelmi reflects the designer’s playful and experimental approach to form. Known for his boundless imagination and curiosity, Toikka saw glass as a living material — something to be shaped, tested and enjoyed rather than controlled too tightly.

While Toikka is often celebrated for his expressive, colourful works, Kastehelmi reveals another side of his thinking: precise, methodical and deeply attuned to material behaviour. The result is a collection that feels joyful yet restrained, decorative yet timeless. For over fifty years, Kastehelmi has remained a beloved Iittala classic — proof that even the smallest details can leave a lasting impression.