I am called sapphire, my power counteracts poison

A high carat gold and cabochon sapphire ring, circa 1300. It is in the form known as tart mold where the pyramid shaped bezel was designed to envelop a central cabochon gemstone. This ring has its original cornflower blue sapphire. There are traces of original enamel remaining on the cross-hatch engraved shoulders. This ring was more than just a fashionable jewel, it was a protective amulet which drew its power from the sapphire. Medieval authors ascribed magical and spiritual properties to gemstones. The sapphire possessed a wide array of virtues. Aside from its power over poison, the gem was believed to promote general good health and prevent fevers. Its celestial blue colour was described by the writer Bartholomeus Anglicus (died 1272) as ‘most like heaven in fair weather’. The heavenly connection made sapphires a popular choice for  episcopal rings. The ring is size N and 1/2 [US 6 and 3/4] and has survived in fine, original and wearable condition.

£6000

For a fascinating article on the power of the sapphire in the medieval world see:
Peregrinations : Journal of Medieval Art and Architecture Volume 9, Issue 1,
Power and Poison : A Medieval Sapphire Ring in the Gotlands Museum Sweden by Louise Martinez.