Thanks 992234177.

The Google translation makes it difficult to be sure of what was said in the original, and sadly I have no Spanish to help me.

But, I think the writer was comparing the Alba emerald ducal crown to the one given by Franco to Queen Fabiola which must have originally had rubies.

I wonder if the reference to the different number of strawberry leaves is because the jewel can be worn in various versions, as a closed coronet or as an open tiara. Presumably the strawberry leaves, or at least some of them, are detachable and can be fixed at different points?

Or have I completely misunderstood?