At the Queen’s birthday church service, Kate wore her aquamarine and diamond drop earrings, along with a new pendant necklace.
Many of us in the Kate style blogging world have decided that this is most likely an aquamarine stone. The chain could be either white gold or silver, but I think it’s most likely white gold. The setting around the gemstone looks to be more round than square, and the aquamarine stone is set forward, slightly out of the halo.
Here it is on Kate: