by uxr51 » Aug 18, 2019 Hello, I have been lurking for quite some time and wondered why no one seems to own Brian Gavin Black? Almost everyone goes for WF ACA or CBI on super ideal diamonds. Some go for the signature line. Any particular reasons why? Or is BGD black more of a local dealer or niche market? I have searched all across the internet and on this forum for owners and found very little info on how those diamonds actually perform. Supposedly the facets are "tuned" for performance in a similar way as CBI diamonds claim they do. Has anyone compared BGD Black to CBI in person? User @RunningwithScissors compared Wf ACA, BGD Black and CBI and went with a CBI. I don't know how to contact her but did not find a post with details on why she went with CBI.