"I sent the cursed jewels to our home city for research, then waited for a reply. After several weeks I grew impatient and sent a messenger, only to find that the jewels had never reached their destination!"
Note that, within the game world, it's about a two-minute trip from that NPC to the home city. I don't know about you, but if I was waiting several weeks for a reply, I'd have gone *myself* . . . or, if these jewels are so valuable, just, you know, brought them over.