Teresa...whispersmom on here knows a lot about chocolates as she used to own one (may still) and she knows what it is that AKC says about them.
I have a gold and white parti-colored yorkie and they do register them AKC if both parents were AKC. I thought it was the same for the chocolates.
They are not common and are usually a little more in price but they are beautiful as all yorkies are.
You may want to do a search or even PM Whispersmom as she is very nice and knowledgeable.