ACA and BGD Signature H&A are branded H&A cuts. All that really means is that they have certain parameters for their brand in addition to the hearts and arrows requirement so that they are very consistent stone to stone. Since Brian Gavin is the orginator of the ACA''s when he was with Whiteflash, they are very similar to the Signature H&A''s with his new company. If you look at angles, tables, depths, etc of the two brands, you will not see much difference.