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Because of physical difference in how various devices
produce colors, each scanner, display, and printer has a different
gamut, or range of colors, that it can represent. The RGB color gamut
can only display approximately 70% of the colors which can be
perceived. The CMYK color gamut is much smaller, reproducing about 20%
of perceivable colors. The color gamut achieved with premixed inks
(like the Pantone Matching System) is also smaller than the RGB gamut.
Note that there are many PMS colors which don't have matches in the
CMYK color gamut.
source: http://www.rapidgraphics.com/faq_gamut.html
 Typically, the RGB gamut contains colors
that can be viewed on a computer or on a television monitor (which
emits red, green, and blue light). Therefore, some colors, such as pure
cyan or pure yellow, can't be displayed accurately on a monitor. The
CMYK gamut is smaller, consisting only of colors that can be printed
using process-color inks. When colors that cannot be printed are
displayed on-screen, they are referred to as out-of-gamut colors—that
is, outside the CMYK gamut
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