Note 742 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647
John Bostock translation
This famous and somewhat improbable story of the ring of Polycrates is told by Valerius Maximus, B. vi. c. 9; Herodotus, B. iii.; and Cicero, De Finibus, B. iv. Pliny again mentions it in B. xxxvii. cc. 2, 4.