I have a few gold and silver tone necklaces that are losing their colour and end up just chucking them but with brooches I found that a couple of coats of nail varnish makes them fun coloured and good as new!
I got this brooch on ebay to go with my gifted cat eyed brooch to have a His & Hers kinda thing. It has little gems but one was missing so I got it for £1.50. I knew I was going to cover it in nail varnish so a stone missing did not make any difference as it would not be noticeable.
This would work on earrings and other things. Do you have anything you can paint and use again? I would love to see!