How do they change jewels to different colors?
Traditionally, I have seen topaz, for example, in two colors, yellow and blue. Now, I'm seeing topaz in white, pink, and even multi-colored mystic topaz. How do they do that?
Right, like the others said- most stones are found naturally in many different colors, but usually there are one or two colors that are most common and so become what you associate with that stone because that's what's on the market. Scientists can also create stones in labs that are the same in structure to the natural stones (essentially the same as a natural stone), but are man made. An example would be man made opal- this is usually imitation fire opal and you can tell the difference by looking at the crystal structure of the stone, which looks different in man made opal than real opal. There are ways to artificially color stones, but usually this is not done unless it is a laboratory grown stone or is not a very high quality stone because most pure stones are worth more in their natural color (most stones don't take artificial coloring well and look better in their original color). Rarer colors of stones tend to be more expensive, so if you see stones that are of unusual color that you don't usually see on the market or relatively rare stones set in jewelery selling for less than you would expect, chances are it's not real (you can usually find words like created, laboratory grown, man made, etc. on jewelery like this. Usually if you see a stone that is exceptionally brilliant (shiny 
or that is not a color you are used to seeing, it is man made.
Hope this clears things up a bit!
PS- There is nothing wrong with man-made stones! These are actually a more responsible choice for many stones because man-made stones do not cause blood wars or require mining that screws up the environment.
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