We used a 10 mm wide strip of solid copper. Then milled an indentation on the inside of either side, two magnets inserted, sealed with allergen-free acryl compound.
No direct contact with the magnets and Your skin. smoothed edges. Bent into shape, then polished shiny.
Please note: Be careful with jewelry containing magnets! Do not wear jewelry with magnets if You wear a pacemaker. The magnets we use are unusually strong, keep distance to electronic devices, mechanical watches, older TV-sets. Please refer to the manual included in Your order. Measure up carefully. Exact size allows a very close fit.