Some thoughts on the Q Link...
1. Physically and mechanically speaking... It looks like a coil of some kind; an antenna. That is, incoming radio wave energy would be absorbed and turned into an electromagnetic field plus heat. The heat part means that EM is transformed into an energy type which the body is perfectly suited to dealing with without ill effects. The electromagnetic field.., not so much. In any case, it would only count for the small region of space that the pendent occupies. Maybe if it's over the heart or some etheric center, it might have some impact, but it seems insignificant when you're bathed in EM waves of all sorts emanating from countless vectors. -For a Faraday Cage to work at blocking a signal, it needs to fully enclose an area. Scottie's experimental triple-lined foil box for cell phones is an apt example of this.
So in terms of traditionally understood EM field blocking, this pendant does zilch.
2. The stated beneficial effect, however, isn't about blocking EM. It's about absorbing and resonating a field which the human body supposedly naturally works best within. So it may be an enhanced field anchor, perhaps? If that is so, then it might be like adding a nutritional supplement to one's energy field, strengthening your immunity in general. -Like the way plants when they don't have enough minerals in the soil are more likely to suffer from the trials of life and disease. When you artificially add extra nutrients, they are better at fending off predators and other negatives.
3. Q Link Religion! -If there are thousands of people out there in the world actively believing in the protective qualities of the pendant, then maybe you're plugging into some sort of collective creative field..? Seems far out, and it's hard to gage, but why not? The C's told us once that a tsunami was the result of human collective creative energy being artificially repressed; "It has to go somewhere".
4. Somewhat off topic.., but I like the silk idea. With 5G millimeter waves, solid objects tend to reflect them. Here's a picture of a comparison of several common clothing fibers under a microscope:
Silk looks like it might be good at bouncing rather than absorbing.
I might look into wearing a silk-lined bandanna on my noggin.
Personally.., while I do find the resonance idea (#2) appealing in that it makes a kind of sense, it seems like a reach at the moment in need of a lot more supporting data. I generally don't trust necklaces and magic pendants bought on the internet. The Q Link site offers lots and lots of epidemiological and before/after subject studies, which frankly, is among the weakest kind of science available, (second perhaps only to climate science.)
I'd be MUCH more interested in knowing where and how the original inventor came up with the pendant design. Was it channeled information through some sort of medium, (like Reiki symbols)? Or was it the result of lots of theorizing and tests? What was the thought process? Did it make sense or was if full of bad assumptions? The sales website offers us nothing in this regard but slippery brochure copy which makes lots of airy fairy promises and seems kind of carpet baggy.
-Raw testimonials are next to useless unless people are reporting physical shocks, shrieking babies, shattered dishes and such; there's a certain threshold of reported phenomenon intensity which needs to be surpassed before I perk up and pay attention, and the kinds of soft experiential reports the Q Link has resulted in rate pretty low for me. (Except to determine the religiosity quotient, the honeymoon v buyer's remorse factor. Even if there is an effect, the average mystical crystal shop customer survey is about as convincing to me as.., something very unconvincing. People buy into all kinds of dumb crap, including orgone energy generators (for cloud busting of all goddamned things), Indigo Children and Scientology. It's an uphill chore to weed the roses from the CIA/Lizard-inspired crab grass.
Another kind of evidence I might feel compelled by would be some kind of trusted meditation or psychic expert with a decent track record delving in on the topic and reporting back.