British Museum
The sapphire as an eye-stone. The woman points to her eye, which the physician is about to relieve by applying a sapphire ring
Johannis de Cuba, “Ortus Sanitatis,” [Strassburg, 1483], De lapidibus, cap. cix
Curious test of the genuineness of a garnet set in a ring. Should the stone not be an imitation, flies and wasps will not alight on the wearer’s body, even though it be smeared with oil
Johannis de Cuba, “Ortus Sanitatis,” [Strassburg, 1483], De lapidibus, cap. lx
Jeweller offering rings
Johannis de Cuba, “Ortus Sanitatis,” [Strassburg, 1483], De lapidibus, cap. lxv