Magnifying Glass Antique Silver Swirly Art Nouveau Loupe Pendant Necklace 20x comes with a 925 sterling silver snake style chain that measures 30 inches long for easy access(not shown in photos). Please keep in mind that the style of the chain may vary. The loupe itself, measures 1 inch x 1 inch. The lens measures 21mm in diameter. Professional quality. Loupe comes in a round chrome plated swing-away case. Handy and easy to use. It is 20x strong and has a focal distance of 1/2" (13mm). Would make a great gift or you can make it yours today. Any questions, please contact me, thank you.