What do you call this ring?

ring

If you look at this ring, there is a frequency-like mark.

I often see people wearing rings like this, what do you call rings like this?

375 2017-04-11 Gentleman

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A. 1

It's a sound wave ring.

Gentleman 9 years ago 0

A. 2

It's called a sound wave ring.
The desired voice is recorded and the wavelength is engraved on the ring.

Gentleman 9 years ago 0

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