Yes, and Meridia studies the gem and the magical fluctuations faintly emanating from deep within ... but also from somewhere else. You determine your knowledge (arcana) is sufficient to ward the gem. It will merely require a variation on the alarms and wards spell. Like any good mage, you surely have that particular spell in your spell book, right?
OOC:
For a variant spell like this, you will have to do what I refer to as long casting. This is like ritual magic where the spell and a place is postulated for spell work. Say about an hour prep and 10 minute cast.
Though how she's kept the gem from Dormir for so long is anyone's guess.