Tools used for stretching ear lobes usually. Not an accessory, but many people do wear them as jewelry. It is not safe though because it can imbalance your ears, since the sides are different sizes. The gauge size is at the bigger end of the taper.
"Can I buy some tapers to stretch my ears?"
"She used tapers as jewelry and now her ears are uneven."
"Dude! Those tapers are for stretching, not wearing!"