Naomi's Pendant is a item in Corpse Party: Segen der verlassenen Schule. IT is used to detect malevolent spirits.
Corpse Party: Segen der verlassenen Schule
In terms of appearance, is a 6 winged jewel with a vivid red jewel hanging off the connection of the wings. In the storyline, it is a present from Natsumi, her mother, who hand-crafted the necklace and gave it to Naomi when she turned 18.
The bottom crystal is used to identify when Naomi is within the range of malevolent forces, as a precaution to avoid the encounter- mainly due to lack of equipment.