Camp Necklace

The Camp Necklace is given to each camper at the end of each summer at Camp Half-Blood. The cabin senior counselors vote on the biggest event of the summer and paint it on a bead.

The Lightning Thief
A black bead with a green trident. Percy's first year.

The Sea of Monsters
The golden fleece. Percy's second year.

The Titan's Curse
None. The time was during the winter between The Sea of Monsters and The Battle of the Labyrinth.

The Battle of the Labyrinth
An intricately designed maze to represent the Labyrinth. Percy's third year.

The Last Olympian
The Empire State Building with the names of the deceased in tiny Greek letters. Percy's fourth year.

The Lost Hero
It does not mention a bead being made because it was in the winter, during the same year of The Last Olympian.

There are five beads on Annabeth's necklace at the start of The Lightning Thief, from years before the books. The ones said were Thalia's tree, a centaur in a prom dress, and a Greek trireme on fire. Percy interrupts her, so the last two are unknown. It is assumed Luke has the same set, since he and Annabeth arrived at the same time. But Luke left Camp Half-Blood, and he does not have the 2nd, 3rd, and 4th beads.

Line
At the Roman Camp Half Blood, campers would get a line instead of a bead for each summer.