Weight: 1 lb.
Estimated Value (Sane Cost Guide): 3,000 gp
DMG Value: 101 gp - 500 gp
The medallion has 3 charges. While wearing it, you can use an action and expend 1 charge to cast the detect thoughts spell (save DC 13) from it. The medallion regains 1d3 expended charges daily at dawn.
Source: DMG p181