For once, those items actually do emit energy...can you guess how are actually called materials that spontaneously emit energy?
So, here's a detailed study of such pendants: https://pmc.ncbi.nlm.nih.gov/articles/PMC8168844/
Indeed, the correct adjective isn't "quantum" nor "scalar" but...radioactive. Which the manufacturers apparently didn't consider as a good sales pitch, since they intended to dump those things as "a protection against electromagnetic radiations"
Their radioactivity comes from both thorium and uranium, which they contain in the form of monazite. For the most active of those pendants, if worn 24/7, radiation exposure limits recommended for the general public would be exceeded by a factor of about five.
Which is just unecessary exposure to ionizing radiation. Especially considering that, unlike what is advertised, that won't interfere at all with other types of electromagnetic radiations such as radio waves (which, by the way, are non-ionizing, unlike the radiations emitted by those pendants!).
This might rise memories amongst those who ever came by the totally rascist kid's adventure books where the white hero "Bob Morane" was facing the chinese evil mastermind known as the "Yellow Shadow" (yeah...) who was importing radioactive pendants into decadent occidental countries as an act of terrorism
