Blue Juice Studio makes stunning jewellery, made from discarded fishing nets that otherwise harm marine wildlife in the oceans. Ghost fishing waste is one of the most damaging aspects of ocean litter today, so this is a great way to use it up (rather than clothing, which just deposits more plastic back in washing machines).
Jewellery is worn by millions of people. Mining for gold and silver obviously has impacts on the environment and wildlife (whether ‘ethical’ or not) and although blood diamonds (profits funding civil war) are not common these days, there is enough already-mined gold and silver on earth to last for eternity. Go for vegan-friendly jewellery (free from bone, shell, feathers, pearls, leather).
Donate broken necklaces or odd earrings to Recycling for Good Causes (list your local animal shelter: they sell the metal and pass on funds).