Fabricators and vendors of magnetic jewellery just state the Gauss rating of the magnets embedded in their article without specifying whether it is core or surface strength. Some of these magnetic jewellery articles boast and boost the Gauss strength often as high as 15, 000. There is a catch. Read to find out…
Magnets have two types of strength: core strength and surface strength. What is relevant for users of gem & jewellery containing magnets is to check out the surface strength as this s the one that penetrates the skin. Only few magnetic jewellery fabricators are willing to disclose both ratings. Many would not attempt to do so, lest it confuses the buyers.
Core strength: This is the nominal strength of a magnet. Different terminology is used to indicate core strength. Manufactured rate, Material value, Central gauss, Face value and Internal strength are some of the alternatives used by manufacturers to denote core strength.
Surface strength: This is the real strength of a magnet. Terminology used to refer real strength of magnet includes Actual reading and External strength.
You as a buyer and user have every right to ask from the sellers of magnetic jewellery the surface strength of magnets placed within the articles. If nothing is forthcoming or specified as surface strength then take the given Gauss rating by the seller and divide it by 4. For example if the magnetic jewellery piece is stated to possess 12,000 Gauss then you can easily find out that the surface strength as 3,000 Gauss.
However, original manufacturers of magnets, who are not jewellers, generally give a range value for both core and surface strength. For example, Neodymium magnet is marketed with a core strength between 10,000 to 12,500 Gauss and surface strength with a range of 1,700 and 2,500 Gauss.
Best,
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