Idk if this is the right part of forums but

I was running catacombs (using my speed set) after killing boss and leaving the map, I realised I was slow. When I checked my inventory my pern dex amulet 15%ms dissappeared into thin air I have checked my inventory, stash, craft. It just disappeared (I 100% didnt sell). What happened to it? is there any way I can get it back? Thanks
Ign Aerielace