I say buy your own earrings. Those ones are not yours.
I have a bit of an axe to grind as my mother has an awful habit of taking, throwing away and giving away other peoples' things.
I'll never forget when she asked if she could lend my smart job interview jacket to a friend of hers. I said 'no', but a couple of months later I was looking for it for an interview and it had gone. She had lent it anyway and never got it back.
I was a poor student and my mum and her friend were fairly well-off middle-aged ladies. I didn't even know her friend's name!
A couple of years ago, I went to visit my mum and found her wearing all of my rings. I don't have many and most of them have sentimental value: given to me by old friends or my sister who passed away a few years ago. My mum has plenty of rings herself! She got annoyed when I made her give them back to me. I searched her jewellery box and found more stuff she'd 'borrowed'. All of my gold and silver. I still can't find the bracelet my nan gave me.
I could go on; the time she threw out all of my sister's smart winter clothes because my sister 'hadn't been wearing them'. My sister was living in Japan at the time and there wasn't much call for wool suits in the 40 degree heat of the Japanese summer. She had to buy a whole new wardrobe which was very inconvenient and cost her a lot of money to replace.
Anywayyyy! I'm not saying you're as bad as my mother, but like you she has absolutely no respect for other people's things. Even with the best will in the world, you could accidentally lose one. They are not yours. Buy your own.