Sweet key pendant charm necklace by Mulberry.
The ring has 8 keys that spells out M, U, L, B, E, R, R, Y.
The piece was clearly inspired by vintage pieces like this key pendant charm in 9ct gold, spelling "I LOVE YOU", which is also available here at felt.
The ring is 2cm in diameter and each key is 2.2cm long. The chain is 71cm.