This is an authentic Roman Tiberius Denarius "Tribute Penny" mounted in an 14K gold bezel pendant.   The bezel was made in Jerusalem.   The bezel weighs approximately 3 grams.  The denarius of Ceasar Tiberius is the same coin referred to by Jesus Christ when asked about paying taxes in Mark 12:15-16.   Ceasar Tiberius ruled from AD14-37, which was during Jesus' lifetime and years of ministry.

"...But Jesus knew their hypocrisy. “Why are you trying to trap me?” he asked. “Bring me a denarius and let me look at it.” ¹⁶ They brought the coin, and he asked them, “Whose image is this? And whose inscription?”  “Caesar’s,” they replied."