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The KonMari (Marie Kondo) website sells a shaped piece of solid aluminium, making the following claims for it:

Tuning Fork

Regular price $50.00

Marie uses a tuning fork in her everyday life to help her to reset. Striking it against something solid – a crystal is ideal – creates pure tones that have the power to restore a sense of balance. This KonMari tuning fork can help you to reset and be present. Made of aluminum alloy, it has a frequency of 4,096 hertz, which is said to amplify the healing properties of crystals – especially quartz.

https://shop.konmari.com/products/konmari-decor-konmari-tuning-fork

Is striking the Marie Kondo tuning fork on a crystal (especially quartz) more effective than placebo in healing illness, injury, or medical conditions of any kind?

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    Doubling zero is still zero – Henry Jan 4 at 12:44
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    I'd like to see a more precise claim. "Amplifying the healing properties" is so vague as to be untestable, even if we were to accept that crystals have magical healing powers. [Spoiler: They don't] – Oddthinking Jan 4 at 13:27
  • @Oddthinking The claim is what it is, I didn’t write it and can’t (without dishonesty) edit it to make it more specific. I’ve made my own question (below the claim) more specific on purpose. IMO they’re being deliberately vague to avoid taking full responsibility for the healing powers they’re claiming the device possesses - eg they use weasel words “said to”. An answer that addresses the lack of healing powers of crystals in general would be very welcome - but I was concerned that you would deem a more general question along those lines insufficiently specific. – A E Jan 4 at 14:56
  • I could see a tuning fork being useful for meditation and being really generous I can see that as being the actual intent (i.e., "restore a sense of balance"); but anything else seems to be leaning heavily on crystals. – rjzii Jan 4 at 22:20
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Wikipedia has a good article on crystal healing, stating that it

is a pseudoscientific alternative medicine technique that uses semiprecious stones and crystals[...] Adherents of the technique claim that these have healing powers, although there is no scientific basis for this claim.

The article also mentions

In 2001 Christopher French, head of the anomalistic psychology research unit at the University of London and colleagues from Goldsmiths College outlined their study of crystal healing at the British Psychological Society Centenary Annual Conference, concluding: "There is no evidence that crystal healing works over and above a placebo effect.”

Crystal healing doesn't work beyond placebo, so the idea that a tuning fork can enhance the "crystal healing effect" can't possibly be true.

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    "amplifies effectiveness of crystals by 1000%" ... – Ben Bolker Jan 6 at 19:35

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