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Fusion is looked down upon at Homeworld, so it's unlikely she's a fusion. We can assume these gems are unique/rare, which is why they're in charge. Yellow Diamond is very big which explains why everyone fears her.
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It may be looked down upon but it might be possible, since we do not get any 360 view of the gems, Fusion is looked down by homeworld but it isn't really, Fusion of two different kinds are looked down by homeworld they view it as disgusting, As said in an Episode on Steven Bomb 4.
And also I have noticed that Lapis Lazuli said "Do you even know who I used to be?" which may be also a information that She was a fusion of Blue Diamond but was trapped in the mirror, You can also see the Paintings or Carving in one of this image.
Which might be the past "Diamonds" exception of Yellow Diamond since you see the image shown has no Gem in her forehead which might be another clue, Saying that Lapiz Lazuli was a fusion of the same kind of gem/class.