Collection of a Toadstone, illustrated inĀ Hortus Sanitatis, published inĀ MainzĀ in 1491.
TheĀ toadstone, also known asĀ bufoniteĀ (fromĀ LatinĀ bufo, “toad”), is a mythical stone orĀ gemĀ that was thought to be found in the head of aĀ toad. It was supposed to be anĀ antidoteĀ to poison and in this it is likeĀ batrachite, supposedly formed in the heads of frogs. Toadstones were actually the button-likeĀ fossilisedĀ teeth ofĀ Lepidotes, an extinct genus ofĀ ray-finned fishĀ from theĀ JurassicĀ andĀ CretaceousĀ periods. They appeared to be “stones that are perfect in form” and were set by European jewellers into magical rings and amulets from Medieval times until the 18th century.
From ancient times people associated the fossils with jewels that were set inside the heads of toads. The toad has poison glands in its skin, so it was naturally assumed that they carried their own antidote and that this took the form of a magical stone. They were first recorded by Pliny the Elder in the first century.
Like tonguestones, toadstones were considered to be antidotes for poison and were also used in the treatment of epilepsy“. As early as the 14th century, people began to adorn jewelry with toadstones for their magical abilities. In their folklore, a toadstone was required to be removed from an old toad while the creature was still alive, and as instructed by the 17th century naturalistEdward Topsell, could be done by setting the toad on a piece of red cloth.
FossilizedĀ Lepidotes, showing detail of the skull, from which toadstones originated
Toadstones from Jurassic sediments in Oxfordshire UK
The true toadstone was taken by contemporary jewellers to be no bigger than the nail of a hand and they varied in colour from a whitish brown through green to black, depending on where they were buried.
They were supposedly most effective against poison when worn against the skin, on which occasion they were thought to heat up, sweat and change colour.
AlternativelyĀ Johannes de Cuba, in his bookĀ Gart der GesundheitĀ of 1485, claimed that toadstone would help with kidney disease and earthly happiness.
Campbell, Marian (2009).Ā Medieval Jewellery in Europe 1100-1500. V&A Publishing. p.Ā 33.Ā ISBNĀ 9781851775828.
Sweet are the uses of adversity; Which, like the toad, ugly and venomous, Wears yet a precious jewel in his head.
In James Branch Cabell‘s short story “Balthazar’s Daughter” (collected in The Certain Hour) and its subsequent play adaptation The Jewel Merchants, Alessandro de Medici attempts to seduce Graciosa by listing various precious jewels in his possession, including “jewels cut from the brain of a toad”.
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