Bible Verses About Rings: Used for sealing decrees

The king's secretaries were summoned on the thirteenth day of the first month. They wrote down all Haman's orders to the king's army commanders and governors in all the provinces and to the officials of every people, to each province in its own script and to each people in their own language; everything was written in the name of King Achashverosh and sealed with the king's signet ring.

You should issue a decree in the king's name for whatever you want concerning the Jews, and seal it with the king's signet ring; because a decree written in the king's name and sealed with the king's ring can't be rescinded by anyone."

They wrote in the name of King Achashverosh and sealed it with the king's signet ring; they sent the letters by couriers on horseback riding fast horses used in the king's service and bred from the royal stock.