Tetradrachmon owl coin ring with blue enamel on oxidized sterling silver coin in gold-filled filigree silver ring. Greek museum replicas. Hellenic mythology, Greek museum replicas. A filigree ring designed by Rafael Santarosa based on the ancient symbol of goddess Athena and therefore her devoted town of Athens. In the middle of a gold-filled sterling silver filigree bezel nest a "Tetradrachmon" Greek Athenian coin on oxidized sterling silver fully covered with a drop of transparent sky-blue enamel. Owl is barely detectable, and one can see thru the enamel in plain light of Sun. Owl is the symbol of wisdom and knowledge. In Greek mythology, a little owl (Athene noctua) traditionally represents or accompanies Athena, the virgin goddess of wisdom, or Minerva, her syncretic incarnation in Roman mythology. Because of such association, the bird—often referred to as the "owl of Athena" or the "owl of Minerva"—has been used as a symbol of knowledge, wisdom, perspicacity and erudition throughout the Western world. Owl is the bird often silver tetradrachm coin at the Archaeological Museum of the city of Athens depicting the owl of Athena (circa 480–420 BC). The inscription "ΑΘΕ" is an abbreviation of ΑΘΗΝΑΙΩΝ, which may be translated as "of the Athenians". In daily use the Athenian drachmas were called glaukes (γλαῦκες, owls). This silver coin was first issued in 479 BC in Athens after the Persians were defeated by the Greeks referred to as the "owl of Athena" or the "owl of Minerva" throughout the Western world. Nowadays it still stands as a symbol of town of modern Athens. he symbol of wisdom and knowledge. Made of oxidized sterling silver coin set in a K18 gold filled sterling silver base. Nowadays it still stands as a symbol of town of modern Athens. A pendant designed by Rafael Santarosa based on the ancient coin Athenian Tetradrachmon iconizing the profile of goddess Athena and therefore her devoted town of Athens. It is the representation of Athena as the Goddess of wisdom and knowledge. Made of oxidized sterling silver coin set in a K18 gold filled sterling silver base. The tetradrachm (Greek: τετράδραχμον, transit. tetradrachm) was an Ancient Greek silver coin equivalent to four drachmae. In Athens it replaced the earlier "heraldic" type of didrachms, and it was in wide circulation from c. 510 to c. 38 BC. The Athenian tetradrachm was perhaps the most widely used coin in the Greek world before the time of Alexander the Great. The silver tetradrachm is believed to be the coin given to Judas for betraying Jesus. An Athenian tetradrachm from after 499 BC, showing the head of Athena and the owl The transition from didrachms to tetradrachms occurred during c. 525–510 BC; the abandonment of the "heraldic"-type didrachms and the Archaic tetradrachms (early "owls") of the polis of Athens apparently took place shortly after the Battle of Salamis, 480 BC. This transition is supported by the discovery of contemporary coin hoards, and more particularly of a coin hoard found on the Acropolis in 1886. The Athenian tetradrachm was widely used in transactions throughout the ancient Greek world, including in cities politically unfriendly to Athens. Athens had silver mines in state ownership, which provided the bullion. Most well-known were the silver mines of Laurium in Athenian countryside. The Athenian tetradrachm was stamped with the head of Athena on the obverse, and on the reverse the image of the owl of Athena, the iconographic symbol of the Athenian polis, with a sprig of olive and a crescent for the moon. According to Philochorus, it was known as glaux (γλαύξ, 'little owl') throughout the ancient world and "owl" in present-day English language numismatics. The design was kept essentially unchanged for over two centuries, by which time it had become stylistically archaic. To differentiate their currency from the rival coinage of Aegina using the Aeginetic stater of about 12.3 grams, Athens minted its tetradrachm based on the "Attic" standard of 4.3 grams per drachma. The vast number of "owls-tetradrachms" available those days mainly from the silver mines of Laurium financed the several achievements of Athens, such as the reconstruction of the Acropolis and building the Parthenon, as well as many wars, including the Peloponnesian War.