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Which powers were believed to belong to a ruby ring during the Middle Ages?

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jewelry Stomacher brooch with emeralds and enamel flowers on gold, from the treasure of the Virgin of Pilar, mid-17th century; in the Victoria and Albert Museum, London.

During the Middle Ages, a ruby ring was believed to possess several protective and auspicious powers, provided it was worn on the left hand. Specifically, it was thought to:

Bring its owner lands and titles.
Bestow virtue.
Protect against seduction.
Prevent effervescence in water.1