Through means unknown to me (she said she searched “Buddhist jewelry” or something), my girlfriend has come across some “alchemical metal” called Lohid alloy. Google insists this metal only exists on the handful of sites selling what appears to be the exact same ring. One site says it was made by Thai alchemical masters “until after the 19th century” and that the means of making it has been lost (verdict is out on why it only costs you 50 bucks then, but whatever). It apparently shines rapidly as you wear it, suggesting some sort of mood-ring-ness to me in its composition. We’ve also determined it likely contains some degree of mercury since the other alloys mentioned on one of the pages have mercury, and the “effects” of wearing it are oddly similar to mercury poisoning.
Even though it’s really obscure, I thought I’d take a stab in the dark and see if anyone knows anything concrete. If you need to take a look, searching Google for Lohid alloy should give you only the few pages with the ring on it.