The subject of MUCH speculation, Kate 'borrowed' the Halo Tiara from The Queen's coffers, which was made by Cartier in 1936. The Queen's father, then the Duke of York, bought the bauble for the Queen Mother, then the Duchess of York (still with me?), who then gave it to her daughter - then Princess Elizabeth - on her 18th birthday.
Set in platinum, the priceless jewel is made from old and baguette-cut diamonds, with the upper part forming a range of lotus flowers and the lower 'zig-zag' part forming a removable piece that can be used as a bandeau.
No word yet on whether or not Catherine gets to keep it for her own collection - or if it's just a loaner. Stay tuned!
According to Today Show blogger, The Windsor Knot, the earrings are diamond-set stylised oak leaves with a pear-shaped diamond drop and a pavé-set diamond acorn suspended in the centre.
Inspiration for the design comes from the Middleton family's new coat of arms, which includes acorns and oak leaves. Cool.
Prince William famously declined to wear a ring because he 'doesn't have a taste for jewelry'. It's a happy day. I'll leave this as a rare "No comment".
Overall, we witnessed a delicate diamond display that's in keeping with Kate's understated jewelry style. We'll see how long that lasts now that she has access to The Queen's stash!