Some of the more significant pearls I have seen in photos since that date are the Hanoverian Pearls and what I think are the Indian Pearls.
The photo below (and others) caught my eye as I don't think these pearls fit what I think are the other two sets. Yet, I do not feel that this set is the one now worn by the Duchess of Cornwall.
I noticed that QEQM is also wearing the bracelet which we have identified as having a sapphire plus a diamond section - which has been worn by the Duchess.