I have only added gems to my ring finger as I prefer it that way. You could do it to all of your fingers if you had enough gems, or maybe every other finger. Which ever you decide looks best.
Clean any edges with a cotton bud dipped in nail polish remover.
Last but not least, apply plenty of clear top coat across the gemmed nail/nails. This seals them in from the top so they'll last longer. Enjoy the dottedness!!
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