There's a lot of Blue Diamond breeders over here (afro violet x sapphire)
As fars as I know, there's only goldbarn in the US. It's not harder to breed than any other recessive mutation, but there's not that many animals - in other words it's not a mutation a lot of people like to work with.
As far as I know, it's near impossible to get hold the rare recessive mutations if you are not planning on breeding them. People do not want the few animals they have to be used as pets and not breedingstock
If I use google to calculate for me, a male BD from Denmark is abour $1,350 and a femal is $2000
We still have furfarmers, so we have a lot of high quality std and black velvet lines to choose from. We also have one fur breeder who likes to breed "advanced" mutations, so we have quite a few high quality BD animals (last I checked he had about 12 BD animals).
But BD is not a mutation per say. It's just like a Pink White a mix between different mutations. But because it's two recessive mutations you need to be shown at the same time, it's hard to breed them...
I'm not sure, but I think this one breeder may also be working on a tripple diamond (afro violet x german violet x sapphire)
I know some may say that violet x sapphire is not a true BD because of Santiago, but the truth is, that Santiago has absolutely no idea what was in the animals he got this new mutation from. He sold a lot of his BD animals to the danish furbreeder (Niels Sørig), and he has worked with the mutation ever since, and he actually know what's in the animals