What is meant by a commissioned signet ring?

The signet was a stamp which was used to impress a picture into wax used to seal a document. It was convenient to have this signet made into a ring.

This might refer to the dirty ring left around a bathtub when someone soaks in a bathtub with soapy bubbles then empties the water. The dirty soap clings to the the sides of the bathtub leaving a...

The finger next to the pinky finger on your left hand

The "Ring of Fire" is the seismically active ring around the Pacific Ocean where there are many volcanoes and earthquakes. These include the west coast of the United States, western Canada, Alaska,...

yes of course!