Ccccantaert's Silent Alarm

You touch a closed door, window, gate, chest, or other entryway, and a magical glyph is inscribed on the sapphire used as a spell component, linking the opening and the gem with each other. You set a password that, when spoken within 5 feet of the object, suppresses this spell for 1 minute. Otherwise, the inscribeed gem will activate each time the door, window, gate, chest, or other entryway is opened for 1 minute, causing it to emit a dim light within a radius of 5 ft and vibrate. Casting knock on the object suppresses Ccccantaert's Silent Alarm for 10 minutes.

When the spell is dispelled, the glyph on the gem remains, turning it back into a regular sapphire, worth 50 gp less then it's original price due to the inscription.