GoldenGytha Claire's use piercing guns, which are designed - badly - for lobe piercings. They basically staple a not-very-sharp ear stud through your ear.
This is not the best way of going about things, as the guns can be quite mucky - you can't autoclave them. There's an (admittedly low) risk of transmitting blood-borne disease.
Also, the studs used are too blunt. They cause crush damage to the tissue. Not a huge problem, usually, on soft lobe tissue, but can cause all manner of swelling & tissue lumps on cartilage.
Oh, & because the studs are too blunt, & the guns malfunction, the studs sometimes get stuck halfway. & have to be forced through, or yanked out. Messy.
& all of this is in the hands of a teenager who trained on a teddy before being let loose on anyone old enough to hold their head up, basically.
www.safepiercing.org/piercing/faq/#guns
I'm off for a nice helix piercing to add to the collection tomorrow. I'll be going to a very capable local blade piercer for it; I won't tell you what she says about Claire's!
The impulsive diamond sounds fab, though Gryffindor.