I'm trying not to judge. ROFL - Ok, how would you do that?
Google tells me this:

1. Arrange the gems on the
nail keycap surface, experimenting with the
nail keycap arrangement until you get a design you like.
2. Remove the stones and dab the
fingernail keycap with gem glue.
3. Place the gems on the
fingernail keycap in the arrangement you chose.
4. Cover the
nail keycap with a clear nail glue to seal your design. Allow your glue to dry completely before touching the
nails keycap.