At this time, the intelligent item mechanics only exist on magic weapons. If you're not very familiar with the editor, then I would just describe all the abilities and languages the necklace has in its description text. The abilities and languages would not be customizable - you couldn't open a form like on an intelligent weapon where you can select them from tables, but the user will have the information they'll need for that item, in order to run a character who has it.
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