Formation Co. jewellery is handcrafted with care, and created responsibly through small batches or made-to-order designs. - The brand use a brass or sterling silver base with a layer of 24k gold plating on top. - All Formation earrings have sterling silver posts and are hypoallergenic. - Gemstones are ethically sourced from responsible suppliers in India. Looking after your Formation Co. jewellery Below is a guide on how to make your Fco jewellery stay golden for longer. Following these steps will prevent scratching, tarnishing and dulling of your favourite pieces. - Storing your jewellery in the protective box or pouch provided will protect the metal from dulling over time. - Remember to remove your jewellery before showering, swimming or exercising. Water can tarnish the gold plating. - Apply lotions and potions before you put on your jewellery. Chemicals can discolour the metal.