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What is the difference between a mined diamond and a lab-created diamond?
Well, I know the obvious answer but I'd like it described in somewhat more detail and I would also like to know if buying a LC diamond is the same as buying one that was mined naturally.
Chemically, physically, mineralogically, they're identical. A carbon diamond-lattice.
The differences are:
(1) Most laboratory diamonds are perfect, with no inclusions, fractures, or accidental elements that would color them.
(2) The majority of laboratory diamonds are gray, tiny, industrial diamonds for use in the electronics industry, as cutting tools, abrasives, and so on.
However, if you have one cut lab gem next to one perfect and cut "natural gem," no one will be able to tell the difference, so there's no purpose in paying more unless you just really need that ability to say that your diamond is a genuine Earth product (Trademark).
In fact, the most prominent reason that a really good gemologist can occasionally tell the lab gem from the natural gem is that it really is... 99.9999% perfect carbon lattice, properly cut like any other rough stone.
Irony? You decide.
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