A simple chain necklace, with a blue gem implanted in a golden pendant.

This Jewel can be used as a spellcasting focus for your wizard spells. When you do so you gain a +1 bonus to spell attack rolls and your spell save DC.

When you create an Arcane Ward, you can choose one creature that you can see within 60 feet of you. That creature also gains an Arcane Ward with a Hit Point total equal to your Wizard level. When you cast an abjuration spell, you can choose to heal either your own ward or that of the additional warded creature.
Additionally, you can use a bonus action to subtract a number of hit points from your own ward and add those hit points to the other warded creature (to a total of your wizard level).

The pendant also has a pool of d6's equal to your proficiency bonus. When your (or another creature's) ward regains hit points, you can choose to roll 1 or more of these d6's and add that number + your Intelligence Modifier to the ward's hit points.

Notes: Bonus: Spell Save DC, Bonus: Spell Attacks, abjurer