Thanks a million, Gert-Jan, for this amazing HQ picture!
As Bryce and Dawn already wrote, the pearls look much better from close! I refrain from my guess, that it are two different strings, the inner strings look is 'ruined' where the pearls cross the neckline of HM's dress. And this makes it looking like the pearls are not well graded. But in fact, they look quite lovely (and have a phantastic luster ). It's always 'difficult', when pearls are wore half way on skin and on clothes...
Thanks again for this wonderful picture! You made my day !