To "Wet Set" these stones, what I do is heat up a bit of silver and the sapphire, once the silver reaches melting temperatures and becomes liquid I push that hot sapphire into that molten silver. Then I fiddle around a bit till its just right and let that silver solidify, holding the sapphire.
I make the posts in 18k gold, just in case your piercing is sensitive to silver.
They come with hand made backs, which fit the adjustable posts.
The backs click on just like any studs you are used to, then you can twist them tighter or looser on your ear for a perfect, comfortable fit.
925 Silver & 18k Gold Posts.