We can think about it logically with a syllogism:
a) I know the render engine follows Snell’s law according to physics theory in literature and does the bending of each wavelength correctly based on that.
b) As partial verification, I know the composition and proportion of it’s spectrum is correct
eg. proportions of green and blue seem to match photo of a rainbow. (loose comparison between Bella rainbow vs photo in the two links bellow)
Given (a) and (b) and given your statement that AB coatings are not as colorful as the OP image, I would conclude that AB coatings are not made to be ABBE-22 … they are probably closer to Abbe 35 or something thereabout. - So my Abbe assumption was wrong about Swarovski coatings.