Mustard Seed gold color Faith Necklace with Sparkling 16-18" adjustable chain for women & girls Beautiful Mustard Seed Faith Necklace with tiny mustard seed. Adjustable 16-18" chain. The single tiny genuine real herb mustard seed is set-in several layers of clear non yellowing resin epoxy and encased in a gold frame circle charm that is 7mm diameter and about 3mm thick. Sparkling Gold adjustable chain. It's a gift with a message!