Hi, Im New with a question

[SilverAstra2000]

Hi, Im Rico frkm the netherlands.
Last week i had my wat stretchen at a shop.
And they told me they could do it for me.
They stretchen from 0.8mm my normal Earring to 3mm.
I was wonderibg is this to gaat..?
They said it was no problem and Have bin doing it for over 20 years.
And i could come Back over 2 weeks and take a bigger size.
Wat would be the wize size to go to?
I want to stop at 6mm, because i think its the nicest size..