No it's not normal, but it doesn't look like it's a blue born, health risks are associated with them. Yours looks more like a golden color and it's actually an incorrect growth patter of the leg and head hair. Adult Yorkies are suppose to have a gold on their legs and head and "blue" which is a metallic black, on their saddle.
I hope you do the responsible thing and don't breed this dog and get it fixed before it is placed in a pet home. Do not sell breeding rights, if you care anything about this breed. There will be people who will breed it to death, but we should never breed flaws into the breed. The dog will make a great loveable pet though! Here's some more information on color.
Goldenray Genetics Chocolate Yorkies Red Golden or Yorkie Blue Borns CDA