Knowing What an Ideal Yorkshire Terrier Looks Like - For Dummies Colors 
 Although Yorkie pups are born black and tan, their color changes as  they mature. The ideal coat color for adult Yorkies is blue (actually a  deep, steel gray; no silver, black, or bronze mixed in) and tan. The AKC  also recognizes black instead of blue and gold instead of tan. Bottom  line? Your Yorkie can be any of these color combinations: blue and gold,  blue and tan, black and gold, and black and tan.
  Not only are these colors the 
only accepted colors, but they also must appear in the accepted places: 
On the body: Blue or black from the back of the neck to the tip of the tail. 
On the head: Golden tan or gold on the fall, with a richer tan/gold on the ears and muzzle. 
On the chest and legs: Tan or gold on the chest. On the  legs, the tan/gold should go no higher than the elbow on the front legs  and the stifle on the hind legs.