Shop › Blue Fibre Necklace - Medium Image 1 of 2 Image 2 of 2 Blue Fibre Necklace - Medium £15.00 Sold Out Sold Out Added! Hand coil-spun necklace. Merino and mulberry silk with mercerised cotton core for strength.Nickel free clasp. Hand coil-spun necklace. Merino and mulberry silk with mercerised cotton core for strength.Nickel free clasp.