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A 10× magnification is good to use for inspecting jewelry and hallmarks [4] and is the Gemological Institute of America's standard for grading diamond clarity. Stones will sometimes be inspected at higher magnifications than 10×, although the depth of field and field of view become too small to be instructive. [ 5 ]
The number, size, color, relative location, orientation, and visibility of inclusions can all affect the relative clarity of a diamond. A clarity grade is assigned based on the overall appearance of the stone under ten times magnification, which is the standard magnification for loupes used in the gem world.
The loupe also allows you to read any markings (if any exist) regarding gold and silver quality. For example, 10k, 14k, and 18k mean 10-carat, 14-carat, and 18-carat gold, and 925 indicates ...
Jeweller's loupes are high magnification and so have a short focal distance, because this is easiest to make and isn't inconvenient. Surgical loupes are telescopes with a long focal distance, but are still loupes (and expensive). What a loupe doesn't have (and so magnifiers that do this aren't loupes) is long eye relief.
When a loupe is used, both it and the diamond are usually held fairly close to the eye as a matter of practice. When checking the stone with the naked eye (especially in unclear cases to judge whether an inclusion justifies a grade of I1 as opposed to SI2) a grader's astigmatism (or lack thereof) will determine distance from the eye.
Best for wedding jewelry: Blue Nile. Best for fine jewelry: James Allen. Best for affordable jewelry: Baublebar. Best for trendy jewelry: Mejuri. Best for sustainable jewelry: GLDN. Best for 14k ...
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