Handmade Cruise ring in silver by the artist Jon Ek.
Available in different sizes and is nickel and lead free.
Jon EK is based in Malmö and educated at Konstfack - University of Arts, Design and Crafts, Stockholm. Where he graduated with a master's degree in jewelry art in 2013.
Not sure what size you need? Measure the inner diameter in mm on a ring that you know fits.