Yes, 20G is about the standard size for a regular earing.
The best way to clean earrings with out tarnishing the metal is by using rubbing alcohol. This will not only clean the earrings, but it also works as a disinfectant. Rubbing alcohol does all this without tarnishing the metal.
With a metal detector.
Gold earrings in 9carat are fairly cheap. They are cheaper because there is more metal than there is gold in the metal. They run from about $10.00 to $25.00 per pair.
Magnetic earrings are typically not made of metal that contains significant amounts of ferromagnetic material, so they are less likely to trigger a metal detector at an airport. However, if the earrings contain enough metal or are made from certain alloys, they might cause the detector to beep. It ultimately depends on the specific sensitivity settings of the metal detector and the composition of the earrings. If you're concerned, it's best to check with airport security or consider removing them before passing through the detector.
Most circle earrings are completely sterling silver or sterling silver plated with gold. But some are a base metal, which depends on company, and then plated with gold. Most generally the plated base metal earrings are costume and not very valuable.
"The price range of moissanite earrings is from 100 dollars to 1,000 dollars depending on the size and where you purchase them from. The smaller the better for earrings."
Some people are allergic to having certain metal compounds coming into contact with their skin. In order to avoid this hypoallergenic earrings are plated with a different metal to avoid a reaction.
Barbells usually consist of a long metal bar and plates fitted to either end. The bar on a men's barbell is longer than that of a female one. The plates are usually made from either cast iron or a solid rubber.
Have you tried different metals? Look for surgical steel, glass or titanium earrings. It may just be that you are allergic to nickel or another metal commonly used in earrings.
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Depending on the metal content there can be a small amount of nickel mixed in with the metal before casting.
No. The smallest item I have had to remove was my watch.