anti poison jewels

The king’s cupboards were framed in silver and adorned with jewels, and the chief butler
was the noble knight Sir Kay, who was in charge of the wine. The king had sixty identical
goblets, exquisitely encrusted with precious stones (no poison could endanger the drink,
for the venom would be rendered harmless by virtue of these stones).

Alliterative Morte Arthur - Translation by https://reflection.eleusinianm.co.uk/