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Assume that I'm going to investigate if jewelry pieces are strong enough under external loads. For example, consider a ring. I want to investigate if it can resist a punch force, or everyday forces like carrying a heavy suitcase while wearing the ring, or even sudden banging to a wall accidentally.

Is there any guideline or standard or code that helps me determine the direction and magnitude of the external loads on the jewelry pieces? Any documentation on that? Sorry if it sounds like a stupid question, I'm just trying to find a hint.

I'm specifically focusing on the gold metal and alloys of it.

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    "Jewelry" is a term that encompasses such a wide range of materials that you won't find any scientific literature on the properties of it. But you certainly can find such information about specific materials like gold, silver, diamonds and others. One well-known example is that pure gold is so soft and malleable that it will bend when worn as a ring. So the gold used for jewelry is an alloy of gold and silver (and sometimes other metals) that is stronger and resists damage more.
    – Elmy
    Nov 20, 2023 at 5:46
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    @Elmy Thanks. I updated my post accordingly.
    – Megidd
    Nov 20, 2023 at 7:34
  • Have you ever had a gold ring break ? Do you know anyone who had a gold ring break ? Nov 20, 2023 at 15:56
  • @blacksmith37 I have not. But there are people with broken gold jewelry like bracelets, necklaces, and more. The failure will be a concern especially if you, as the manufacturer, want to make the jewelry gold as light as possible :)
    – Megidd
    Nov 20, 2023 at 16:08

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There is an industry standard, ASTM F2999-19, but it's focus is determining safety (mechanical hazards and material toxicity).


Here you can find a study comparing the wear resistance between platinum and gold alloys. It uses "standardised industrial procedures in order to provide comparable and reproducible conditions".
I have linked all the standards used to official sites (which are not always particularly practical).

The following procedures are outlined in the paper:

  • Scratch testing, using "a conical Rockwell C hardness tester with a diamond indenter under controlled loads". Ground and polished 'coupons' were made of the 6 tested alloys (see Figure 1), and these underwent "scratching under both constant and increasing loads".
    See paragraph '2.1 Scratch Test' for more details.

  • Wear testing. Cubes were made of the alloys (see Figure 2) for these tests.

    1. "an abrasion test that utilises a stone and sand media"
    2. "a corrosion test in artificial human sweat"
    3. "a polishing test employing a nutshell media"

    Tests 1 and 3 make use of an industrial standard for testing for the "detection of nickel release", DIN EN 12472 (see Figure 3).
    See paragraph '2.2 Wear Testing' for more details.
    The corrosion test was performed according to the standard ISO 3160-2 for corrosion resistance, and "involves application of artificial human sweat to the test cubes followed by heating in a closed chamber".
    See paragraph '2.3 Corrosion Testing' for more details.

  • "Tensile testing was performed in accordance with ISO 6892-1 and microhardness testing was done using a 100 g load (HV0.1) in accordance with [the withdrawn Vickers hardness test] DIN EN ISO 6507-1".
    More details on the mechanical properties testing that was performed can be found in this PDF.

I realize these might not all be of import to you, but hopefully give you a starting point.

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  • Uhm, shouldn't the content of the paper be properly marked as a quote? Or did you summarize the paper in your own words?
    – Elmy
    Nov 21, 2023 at 16:05
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    @Elmy The words outside the quotation marks are mine, and inside are quotes from the paper, yes.
    – Joachim
    Nov 21, 2023 at 16:22
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    Thanks :) It was great.
    – Megidd
    Nov 22, 2023 at 12:19
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    The link to the PDF file looks broken. Maybe this is the link. It is an awesome paper to read.
    – Megidd
    Nov 22, 2023 at 14:28
  • @Megidd Yes, that's it. I sillily linked to the file on my PC. Thanks!
    – Joachim
    Nov 22, 2023 at 23:52

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