Adam Clarke Bible Commentary

The king took his ring - In this ring was no doubt included his privy seal, and he gave this to Haman, that when he had formed such a decree as he thought fit, he might seal it with this ring, which would give it its due force and influence among the rulers of the provinces. The privy seal of many of our sovereigns appears to have been inserted in their rings; and the seals of Eastern potentates were worn in rings upon their fingers. One such seal, once the property of the late Tippoo Sultan, lies before me; the inscription is deeply cut in silver, which is set in a massy carriage of gold. This, as fitted to the finger, he probably kept always on his hand, to be ready to seal despatches, etc., or it might be carried by a confidential officer for the same purpose, as it seems to refer to one of the chief cutcheries, or military officers.