Yes, those are the Queen's Bahrain Pearl Earrings along with the Queen's Japanese Pearl Choker. I was actually thinking a few hours before the funeral how it would be really sweet if the Duchess wore those earrings.
The Princess Royal wore her Grima Pearl Earrings, which I believe were a gift from her parents in the 60s. More significant is her Star of the Order of the Garter.
The Countess of Wessex wore the heart brooch given to her by Prince Edward as a first anniversary present. It can also be worn as the clasp of a choker. Lady Louise wore a brooch connected to carriage driving, a hobby she shared with her late grandfather.
Lady Sarah Chatto wore the Greville Pearl Earrings!
Countess Mountbatten wore a Diamond Floral Brooch that fellow poster JR and I call her 'Funeral Brooch' because she also wore it to the funeral of her mother-in-law, and of Grand Duke Jean of Luxembourg!
Also, here is a picture of the Duke of Edinburgh's insignia on display at St George's Chapel