Depending on your ferret, either a nylon kitten collar, a thin, flat leather puppy collar, or a piece of ball chain will work well. (petpeoplesplace.com)
One layer with a simple link chain, another layer a simple ball chain, and the third layer with linked chain with multi sized circle charms all along the chain. (sophieandtrey.com)
Make a Joyful Noise Psalm 100 vs 1 Hand Stamped square pendant on black gunmetal ball chain necklace bird song (etsy.com)