A green tourmaline, diamond and enamel 'Secret Garden' ring, by Theo Fennell

A green tourmaline, diamond and enamel 'Secret Garden' ring, by Theo Fennell
The oval-cut green tourmaline and brilliant-cut diamond surround to castle-design shoulders and gallery, with an opening door on each shoulder revealing an enamelled representation of a garden, in maker's case, London hallmark, finger size N½
Signed Fennell, maker's mark TF