''onyx'' - is correct. The word ''onyx'' comes from the Greek and means "nail," with reference to the human fingernail. Some onyxes are the color of the human fingernail, including the changes in color characteristic of the fingernail, with bands of lighter color, corresponding to the lighter fingernail color toward the cuticle and at the end. | ''onyx'' - is correct. The word ''onyx'' comes from the Greek and means "nail," with reference to the human fingernail. Some onyxes are the color of the human fingernail, including the changes in color characteristic of the fingernail, with bands of lighter color, corresponding to the lighter fingernail color toward the cuticle and at the end. |