Jewelry fraud:
radiation color treatment

    Exposing off-color diamonds such as yellowish- or brownish- tinted stones to certain types of radiation can result in the production of fancy colored stones.

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     This treatment produces rich yellows, greens, and blues, and greatly enhances salability because these colors are very desirable. In and of itself, radiation is not fraud; in fact, it may make a "fancy" color diamond affordable to someone otherwise unable to afford one.
     But again, just be sure that the stone is properly represented and you know what you are buying, and that you are getting it at the right price - which should be much lower than that of the natural fancy. Treated stones must be represented as "treated stones" and should be priced accordingly.