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There are a number of makers who use a "WM" stamp, you can check on this page which one looks similar to the one on your jewelry Indian Native American hallmarks M Z

It could have been made by a certain Yazzie Johnson - http://www.art-amerindien.com/native_american_marks/w/y-yazzie-johnson-navajo.jpg

Could be Linda Yazzie, or this site might just have tagged the photo incorrectly - http://www.art-amerindien.com/native_american_marks/l/ly-linda-yazzie_navajo.jpg

I think it might be the trademark of UNL Designs Jewelry - eBay View About Me for unldesigns

It does have some gold in it, but only around 37.5% (9 carats), the rest would be alloy metals which are used to harden your jewelry since pure gold is quite soft.

You can most probably have it pierced in the same spot. The thing you are feeling might be the scar tissue that formed, which is just skin, nothing a proper piercing job can't handle.

In addition however, an appraisal is just an estimate of the value. It would be good if you can take it to a reputable jeweler. Beware of jewelers and appraisers who will give you a quote, then try...

You probably need a clear tongue piercing retainer to keep the hole open. If you've had it for over a year it's safe to say that it won't close after one or two days, but it can heal if you leave it...

It would take an awful lot to break or shatter a diamond, but it is possible for it to get damaged while being mounted. An extremely thin or very thin girdle (perimeter of the diamond) is prone to...

Synthetic is a blanket term for any diamond that is made in a lab. CZ or Cubic Zirconia is synthetic, but so is (synthetic) Moissanite, which is another diamond replicant. Then there are lab grown...