Hi, I don't know of any special name for the button you posted in the album, here's a picture of it. The National Button Society would consider this a black glass button with bead embellishment. Buttons like these are hard to find in good condition but they aren't rare. Value is in the $3-$4 range in my experience. Black glass are the most commonly found antique glass buttons of all due to the huge numbers made and worn in the Victorian era. To see the button closer, click on the image or go to the photo album "divas" entry and click on the small image to enlarge it. -Carol C-