Thanks Waffle, these were gel nails and when I did the final coat of top gloss I pushed them into the gel before curing.
Tbh I put a thin coat of top gloss over the whole nail as normal compley OK ng the hand, then I went back and put a dot of top gloss where I wanted the crystals and popped the crystal onto it, pushed it down a tad to cover not only its base but the widest part then did more doing the same then cured.
The idea being that once cured the widest part of the crystal would be held in the hardened fell rather than sat on top.
There is nothing covering them only a wipe of cleanse to remove tacky later and cuticle oil.. They are really really blingy in real life xx