This ability to surpass the quality of "natural" diamonds has caused considerable concern among those in the mined diamond business who have lobbied heavily to have lab-grown diamonds distinguished from "natural diamonds". Gem-quality diamonds grown in a lab can be chemically, physically and optically identical (and sometimes superior) to naturally occurring ones. Note that lab-grown diamonds will also normally have no imperfections because they are also produced in carefully controlled environments.Don't use imperfections as the determining factor in whether your diamond is real or not. It is possible, however, that a real diamond will be flawless.A gem that is too perfect is more often than not a fake. That's because they are grown in sterile environments instead of produced by chance in the Earth's laboratory. Cubic zirconium (which should pass all of the other tests) usually doesn't have imperfections.These are both signs that you're dealing with a real, albeit imperfect, diamond. Look for small flecks of minerals, or very slight color changes. Mined diamonds usually have small naturally occurring imperfections, which are called "inclusions," that can be seen with a loupe. You can usually borrow one from the jewelry store. Use a jeweler's loupe to inspect the diamond.
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