This set (4 coasters) of blue agate slice coasters have gold or silver edges for a finished look. Each agate coaster is unique with a beautiful true blue on the outside and lighter white swirl of blue and white crystals in the middle. These stone coasters are fairly large, measuring from 3 1/2"-4 1/2" inches. They come with optional clear bumpers to protect the agate slice as well as your table. This agate coaster set makes a nice housewarming or hostess gift--or use them during a dinner party for gorgeous table decor.