They're called cuffs. If there are piercings, they're called industrials. Also there's clip ons, and a lot of earrings come with cuffs! Claire's has really great cuffs, but I'm not a huge fan because jewelry should look expensive and glam [:
I really like shopping for earrings at Chloe + Isabel, and now I'm a merchandiser! I strongly encourage you to check out my collection:
https://www.chloeandisabel.com/boutique/angelazhou. Give it a try if you'd like! There aren't cuffs, but definitely amazing selections!