[topknot]

With yorkies - "Rare" is Not a good term. Once you read and understand the standard and genetics - you learn this is a bad thing and should not be bred for nor should breed a yorkie of this color.
It should not bring in a higher price either, but actually should be a lower price. One should breed for quality, not rarity (making others Think it is better when it is not.) This would be deception. I just wanted to make sure other readers that did not know this be informed. You know how one thing gets started and then others think it to be true when in reality it is just the opposite.

As others have stated it is best to be well informed when breeding and you should really know the standard. Also do the health testing on your dogs before breeding to know if they should be breed.