Daddy or Mommy Ring is a nice ring to get your Dad or Grandfather (or even husband). I like the satin finish for a man but the artist has several finishes including a shiny finish. I also like the thick band. Have his kids or grandkids names inscribed diagonally or straight across. This is definitely a keepsake he will treasure that won't be buried in his dresser and instead worn all the time.
Available at Bddesigns.etsy.com.
Note: This artist isn't accepting anymore custom items to be ready in time for Christmas although this doesn't have to be a Christmas gift. She has many other ready to ship items.