To know the ring size
There is an application called ring sizer that tells you the size of your finger
Download the application
On Android https://play.google.com/store/apps/details?id=ru.cherrydesign.ringsizer&hl=en_US
On Apple https://apps.apple.com/us/app/ring-sizer-by-jason-withers/id795721582
Explanation of use https://www.youtube.com/watch?v=wXWPJ9GqYPk
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To know the size of the bracelets https://rb.gy/nf65z2
