Source : Webster's Revised Unabridged Dictionary (1913)

Variegation \Va`ri*e*ga"tion\, n.
   The act of variegating or diversifying, or the state of being
   diversified, by different colors; diversity of colors.

Source : WordNet®

variegation
     n 1: variability in coloration
     2: the act of introducing variety (especially in investments or
        in the variety of goods and services offered); "my broker
        recommended a greater diversification of my investments";
        "he limited his losses by diversification of his product
        line" [syn: {diversification}]