The 'standard' magnification for a loupe (for jewellery & gemstones, stamps & coins) is 10X.
This one is 20X
The diameter of the lens is 12mm
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20X12 triplet loupe on a stand that holds a ring.
Normally I advise against 20X loupes, they are too strong and unnecessary, and they are too fiddly to focus.
None of that applies to this loupe!
A very rare use for a 20X loupe is to read some laser-engraved serial numbers on the edge (girdle) of a diamond - some of these are simply too small to see with 10X magnification, it is necessary to use 20X. Under normal circumstances focusing a 20X is painful, you move it 2mm too close to the object or 2mm too far way, and it goes out of focus.
Not so here - because the holder is designed to hold a ring so that the diamond is exactly parallel to the lens. You then turn the base to focus, then rotate the platform to get the best view.
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Everything you need to know about magnifiers and magnification.
See information about (and reviews of) loupes (small high-power folding jewellers' magnifiers).
Video (electronic) magnifiers, video magnifiers compared.
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With most magnifiers* magnification and working distance are related. Download our Excel sheet, enter a magnification to see the resulting working distance, enter a working distance to see the resulting magnification.
* excluding surgeons-type, digital & phone magnifiers, and microscopes.