Widow's mite coins could have referred to any number of small copper coins in circulation during the time of Jesus.  They were called widow's mites.  Their value was so small that only widows and poor cared about them.  The coin in each earring is from the Holy Land and is from Biblical times.   Each is different, each is unique due to the age and wear of the coins. Each earring is 5/8 inch in diameter.  These are genuine ancient coins, not replicas.  The setting is sterling silver. 

Luke 21:1-4. Jesus looked up and saw the rich putting their gifts into the offering box, and he saw a poor widow put in two small copper coins. And he said, “Truly, I tell you, this poor widow has put in more than all of them. For they all contributed out of their abundance, but she out of her poverty put in all she had to live on.”

Mark 12: 41-44. And he sat down opposite the treasury and watched the people putting money into the offering box. Many rich people put in large sums. And a poor widow came and put in two small copper coins, which make a penny. And he called his disciples to him and said to them, “Truly, I say to you, this poor widow has put in more than all those who are contributing to the offering box. For they all contributed out of their abundance, but she out of her poverty has put in everything she had, all she had to live on.”