Catherine was seen wearing Asprey London Woodland Charm Necklace during Canada tour. She was recently seen wearing the necklace at the Wimbledon Finale in July 2018. She had 3 charms hanging from a gold chain.
Woodland Collection of the label features many different gems and styles i.e. Oak leaves and pine cones, blackberries and gooseberries, acorns and mushrooms etc. It seems Duchess has oak leaf with mini acorn and mushroom.