This necklace's pretty enamel pendant can be slid to the side to reveal a lightweight optical glass lens 1.65” in diameter with 5X magnification. The adjustable cord is made of 3-ply lightly-waxed polyester. Strong yet supple, it looks like leather, but this favored alternative is cow-approved. Waterproof, too.
 
Each modern monocle also comes in a classic gift box with a cushioned insert to protect and showcase the necklace inside.