It's unfortunate that this is one of the top threads on the google search for "jeweler switched diamond."
I was asked by a customer today if we switched her diamonds on a ring she brought in for us to size for her. I told her "Of course not" and she went on her way. This got me to thinking... I have NEVER seen this happen in the 10 years I've worked in the jewelry industry. I've heard stories like "a friend of a friend had this happen once", but never witnessed it or heard of it happening directly to someone. This doesn't mean that it never happens, just that it is a LOT less common than people think.
It is not worth it to steal someones stone! Not worth the guilt, not worth the money, and certainly worth loosing your job or business to.
This doesn't mean you shouldn't KNOW YOUR STONE. Know the inclusions, the color, the weight, etc.... There are a few bad apples out there. However, most of us love jewelry, the industry, and to see a customer's smile when they get their piece back from the jeweler!
It's unfortunate, that you are a butt hurt faggot.