This article is from the Piercing FAQ, by Anne Greenblatt with numerous contributions by others.
"Bones" are solid one-piece miniature barbells usually worn in healed
eyebrow, nostril, and ear piercings. One or both balls are barely
wider than the gauge of the bar post. A stretching taper may be
necessary for insertion.
2C Facial Piercings & Their Suggested Jewelry
The following contains descriptions of each piercing and suggested
jewelry. Healing times offered are estimates. Healing time and
success rates vary for different people.