I suppose getting a feel for the collection would need clarification--are we still referring to only Augusta Victoria's jewelry or the Hohenzollern jewels (Crown and personal) in total?
I only supplied the information I had at hand--I'm sure there are much better jewel experts than I who could supply more and who have contributed greatly to the accumulation of information on the Windsor jewels. It's to be expected though that there will be more on the latter since the jewels are still commonly seen today--look how some of the jewels belonging to Queens Victoria, Alexandra and Mary have fallen off the radar and they didn't even suffer a revolution! Just the progression of various inheritances, sales, donations to charity and items just stuck away in the vaults. Most of the items I listed above had 'current whereabouts unknown' and sometimes even the provenance of the items.
Based on some of her photos, not just the ones I've posted, Dona seems to have had quite a large quantity (and quality) of brooches, necklaces and earrings. I don't think that she had a good number of tiaras (though just the 5 or so listed would seem pretty good to most of us!) and I don't think she had the opportunity ala Queens Alexandra & Mary or Empresses Marie and Alexandra to show them off. The Hohenzollerns didn't have coronations and I don't think they had the equivalent of the Opening of Parliament which enabled the British Queens to dress themselves in their finest.