Queen Elizabeth ... drawing from her finger the coronation ring, showed it to the Commons, and told them that when she received that ring she had solemnly bound herself in marriage to the realm, and it would be quite sufficient for the memorial of her name, and for her glory, if, when she died, an inscription were engraved on her marble tomb : 'Here lyeth Elizabeth, which (sic) reigned a virgin, and died a woman.' This coronation ring was filed off her finger shortly before her death, on account of the flesh having grown over it.
From Finger-ring Lore: Historical, Legendary, Anecdotal
by William Jones
Queen Elizabeth's ring actually represents a very unique catrgory of promise rings. Learn more about promise rings