A jewelry box that contains a necklace. The silver(ish) chain is quite fine, and long enough that it will hang just below her collar bone. There are three little stars on the chain that can slide around quite easily on it, made from three different metals. They look like gold, silver and rose gold, but this was gotten on the station, so they might not be.
The little card inside the box is handwritten, and it says "Abra, have a brilliant birthday. You're a star, so wear this and shine on. Love, Dan."