This is an authentic 22 Karat Gold American Eagle coin (or American Liberty Gold Coin) set in a 14k yellow gold rope coin bezel. The pendant has a large bail to fit up to a 3.5mm wide chain. The pendant is 0.8 inches wide and 1.5 inches tall (including the bail).
The American Eagle coin has the signature Lady Liberty figure on the front with "LIBERTY" written along the top edge. On the back, there is the signature eagle seal with "UNITED STATES OF AMERICA, 1/10TH OZ GOLD - 5 DOLLARS" written along the edge and on the sides of the eagle it says "E PLURIBUS UNUM, IN GOD WE TRUST".