I went to Claires in the shopping mall for the first set.
I had three concerns: 1) Pain - I hate anything poking through my skin 2) Infections 3) Metal Reactions/allergy
What I Did ... and the Result:
1) Steeled my nerves, prepared for death by piercing
... It was quick and hurt less than getting a flu shot
2) Followed the cleaning instructions rigorously (some times doing one more cleaning-turning per day extra) and kept up the routine for 4 weeks extra, afraid I'd end up at the doctor's office soon.
... No infection, healed nicely
3) Decided to go with 3mm white gold ball studs.
... all was fine for the first 4 months
After 4 months, I started having itching and red earlobes. All my erring related problems stopped as soon as I stared using 3mm titanium ball studs with titanium clutches. I also had no problems with 18K solid yellow gold ball studs with real gold clutches.
Under high magnification, I could see that the shafts of the original White Gold earrings were pitted and it looked like some form of plating was coming off. The combination of the materials used in their piercing type earrings and the Stainless steel clutch (not White gold!) and my body chemistry was not so good.
Next time I started with Titanium.
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It is possible to have a reaction to any metal used in jewelry, in the most extreme cases, some have had to have a slightly larger gauge hole and use a plastic sleeve over the posts.
Brass and Copper are the most common metals that cause allergic reactions.
Nickel allergy is more common that many believe.
Most low cost jewelry has posts or wires that are a low cost base metal (brass, copper, "Nickel Silver", etc) that is plated with another metal (tin, rhodium, nickel, silver, gold, etc), the plating can wear off and expose the base metal.
"Gold Filled" jewelry has a thicker coating of gold than "gold plated" and should stand up to use longer.
Stainless steel works for many people. Stainless steel is an alloy (made from mixing different types of metal), and often contains brass, copper and/or nickel. Many different Stainless alloys are used in jewelry.
Sterling Silver contains copper.
Pure Silver (.999 fine) works fine for most people, but does tarnish.
22K and 18K Gold works fine for most people.
Yellow Gold can be pure (24K - too soft for jewelry), when used in jewelry it is an alloy and often contains copper, silver, zinc, etc. As the karat number drops, the alloy contains less gold (18K is 75% gold ..... 10K is 42% gold) [18K means 18 parts gold to 6 parts other metal].
White Gold is always an alloy (karat numbers apply) and may contain copper, silver, nickel, zinc, tin, etc. The less reactive white golds are often alloys of pure gold and platinum or palladium.
Other colors of gold (Rose, Green, etc) are all alloys and use a wide variety of metals.
Other Pure Metals that rarely cause allergic reactions
Platinum - Very Nice, Very expensive.
Titanium - natural color is a silver-gray. A number of colors are via anodizing (avoid ones that are plated)
Niobium - natural color is a silver-gray. A number of colors are via anodizing (avoid ones that are plated)
-Cindi
P.S. watch for posts or ear wires that have a burr at the end where they were cut, a burr can cut the inside of the hole in your ear and can lead to infection.