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Hi W. Scott! To be honest with you, our grade names of Classic, Royal, Supreme, and Imperial are arbitrary and not meant to "emulate" Sevruga, Osetra (or Russian Sturgeon/Acipenser gueldenstaedtii), or Beluga. Unlike many other sturgeon species, the roe of white sturgeon has a natural variability with regards to color, texture, and egg size which is why we feel grading is necessary. With regards to texture and taste, our white sturgeon caviar has been most closely compared to Osetra from Russian sturgeon/Acipenser gueldenstaedtii.