Locket is an item that can be given to any dateable character to show romantic interest. This unlocks heart level 9 and 10 for that character. The locket can be bought more than once and given to multiple dateables.
The locket cannot be given to the dateable character if another item has been given that day, but this does not count towards the gift per week limit.
How to obtain
|Reach 8 hearts with any NPC