12/27/2011 AT 10:00 AM EST
As she strolled to and from church
with her new royal family on Christmas Day, The Duchess of Cambridge
turned heads as usual.
And, adding some sparkle to her fashionable display was a pair of stunning earrings just visible under her Jane Corbett-designer hat.
PEOPLE has confirmed they are from Kiki McDonough,
and were bought from the designer's store in London.
The designer, who also made jewelry for Prince William
's mother Diana, Princess of Wales, did not want to comment at length but confirmed the stones in the drop earrings are "green amethysts surrounded by diamonds on a diamond hoop." They retail for a little more than $3,000.
And there is increasing speculation that the jewels were a seasonal present from William.
It's not the first time Kate has worn McDonough's jewelry. She has two other pairs of earrings from the store: pear shaped citrines hanging from an 18-carat gold hoops and white topaz studs surrounded by diamonds from the "Grace collection."
The Duchess, 29, wore them both on her summer tour trip to Canada and the States.