Authentic Ancient Bronze Coin of the First Christian Roman Emperor Constantine the Great, set in a 925 Solid Sterling Silver Bezel Pendant. Agate / Labradorite Necklace Included. The Coin minted in Thessalonica, circa 326-328 AD. About 1700 years ago and during the lifetime of Constantine the Great! Approximate pendant''s diameter is 20mm. Approximate necklace''s lengt is 19".