finger-ring~memento mori

Finger-ring; memento mori; gold; enamelled; engraved; set with jewels; bezel in form of clasped book; on upper side is white skull between four stones(sapphire, ruby, emerald and diamond), two green toads and snakes; underside decorated with translucent conventional designs; inside book is white recumbent figure with skull and hour-glass upon green ground, mounted on separate gold plate; black-letter inscription on underside of cover; figure groups on shoulders representing Fall from Grace and Expulsion from Eden; back of hoop in form of hands clasping heart.