Zeiss Pocket Loupe -- 10x

The 10x achromatic triplet folding pocket loupe is the best among all loupes. The GIA and CIBJO specify a high quality 10-power aplanatic achromatic loupe for grading the color, clarity and purity of diamonds and this 13mm (1/2") diameter folding loupe exceeds every requirement for sharp, dispersion-free viewing. Its sealed multiple-lens system comes with standard Zeiss T multi-layer anti-reflective coating, which both minimizes distracting environmental glare and enhances the clarity of the image seen through the lens. The tough, reinforced polymer shell is much lighter than a metal frame, but provides better shock protection for the lenses in the event the loupe is dropped.
Optically effective diameter: 13mm
Refractive power: 40 dpt