Hey Pat if I understand and did not mess up my letters I think the D/g is just gold . The D is because both its parents are dark .
I never bought any gold rams ..All I have besides my longfins from Tom in Hawaii came from my darkest rams with the very first 2 arriving 9/11/18 with 4 very darks ..My first real darks and gold in 1 year of breeding so I called them my F1.
I really don't think there is any value towards the dark from these golds ..They are golds from Dark rams but breed to each other you will get all gold from what I have seen..
There is something funny how the gold blends with GBR and EBR but does not with blacks ??