Weight of a New Testament Denarius is 3.9 grams
Denarius (denarii) was a standard Roman struck coin that appears in the Bible several places in the book of Matthew. At that time (AD 14-37), a denarius weight 3.9 grams and was comprised of 97.5% pure silver. Over its history, a denarius weighed between 3.4 grams and 4.55 grams, with a purity ranging from 5% to 98% pure silver.
A denarius coin appears in the following verses:
Jesus said, "Show me a denarius. Whose image and inscription are on it?"
They replied, "Caesar's"
He siad to them, "Then give unto Caesar that which is Caesar's and to God the things that are God's"