The Claddagh ring (Irish: fáinne Chladaigh) is a traditional Irish ring given which represents love, loyalty, and friendship (the hands represent friendship; the heart represents love; and the crown represents loyalty).
The ring that Princess Diana's brother, Charles Earl Spencer, gave to his first wife, Victoria Lockwood. The crownie thing on top is a bit much - if you removed it, the ring would be such a pretty heart ring!
Featured in Deborah Harkness's "A Discovery of Witches" Gimmel ring. Gold enamel set with diamond and semi precious stone. The hand mechanism twists to unlock and the ring collapses into three interlocking bands.