Variegate
Variegate , transitive verb
[Latin variegatus, past participle of variegare to variegate; varius various + agere to move, make. See Various, and Agent.]
To diversify in external appearance; to mark with different colors; to dapple; to streak; as, to variegate a floor with marble of different colors.
The shells are filled with a white spar, which variegates and adds to the beauty of the stone.