The chances of a blood borne infection such as HIV, Hepatitis B, or Hepatitis C being transmitted from a nonbloody-noninvasive object (such as an earring) is exceedingly low. So low that doctors generally don’t recommend prophylaxis to patients suffering wounds similar to yours.
In fact, earrings holes usually epithelialize (have a layer of skin) within 1 week of being pierced. Therefore, there is often no contact between the earring itself and blood. But you should take this opportunity to get vaccinated for Hepatitis B and update your tenantus vaccine if you haven’t already.
Being that the earring was nonbloody, its likely that no infection occurred. However, if the student recently got his/her ears pierced, has a history suspicious of HIV/hepatitis B/hepatitis C, you have a deep/bleeding puncture wound, or are worried about possible infection, then further evaluation by your primary care physician should be warranted.