Yes you work in concert with the professional body piercer to select the jewellery that best fits the piercing you want.
A helix piercing is a type of cartilage piercing but its the specific name for when you get the top of your cartilage pierced. I'll try to attach a picture of what a helix piercing tends to look like. A cartilage piercing is more of a general term that could refer to any of the many cartilaginous areas of your ear being pierced.
Alpha helix
Claire's does not do any type of body piercing. They only pierce the ears.
You don't "get your industrial pierced" per se, since no part of the ear is called "industrial". An industrial piercing is just another type of cartilage piercing. Depending on the anatomy of your upper ear, you could potentially have quite a few piercings there, including an industrial and 1 or more helix piercings. If you already have a helix piercing and your piercer says it won't be in the way when s/he adds 2 holes on either side of it and puts in an industrial barbell, then absolutely, you can keep the helix piercing. Or, if the placement works out just right, you may only need to get a second hole and use that and the hole from your original helix piercing to place an industrial barbell through your ear. The best thing to do is to see a professional piercer and ask what the best option is based on the shape of your ear and the placement of your existing helix piercing. You could also visit our forum(link is below), post a photo of your ear, and see what piercers and other community members suggest.
Double Helix
A double helix
A daith piercing is one type of ear piercing, this piercing rests deep in the shell of the ear at the root of the helix crus( the ridge of cartilage just above the ear canal that fades down into the conch). Most ears are configured with a pierceable crest at this location. It is a subtle but attractive piercing because of its concentric appearance; the jewelry frames the tissue and, in turn, the ear frames the jewelry. When placed properly, the lower part of the ring seems to come directly out of the ear canal.
Christina Piercing is not a person but is a type of piercing. In this case, a decorative stud is placed in the female genital area. This type of piercing can be uncomfortable is has a high rate of rejection.
It is a double helix shape. Go to google. Type in 'google images'. Then say 'double helix'. Not hard!
It really depends on the type of piercing and long you've had the piercing.
Alpha Helix.
Prices can range from $45.00 ~ $85.00 depending on the type of piercing and the type of jewellery used.