What an excellent item to bring to the world, and one need not grant any magic for it to be worthwhile! Like other gemstones, the Thar stones have their uses for rituals, magic, alchemy and folklore. Pearls of the Forest might have been a more evocative title, but still, a great post.
I like the idea, especially Moons additions to the idea. Perhaps he is still mute simply because he regained his use of vocal chords too late (perhaps not) and so cannot talk without calling attention to his state.