Coffee Pod Creations makes jewellery out of old coffee pods, to save them going to landfill. These aluminium pods make stylish unique items, made in small batches to support the indie community. Disposable coffee pods exist in their millions (bin compostable versions, as caffeine can harm creatures in compost bins).
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).