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https://www.intertek.com/jewelry/
We test to measure torque, tension, compression, flammability, resistance to corrosion and more while helping to ensure your fashion jewelry stands up to repeated and prolonged wear to promote consumer satisfaction. Intertek also offers gem and jewelry testing with trained gemologists. Intertek’s lab is equipped with the most advanced ...
https://www.jewelrytools.com/eurotool/jewelry-testing-supplies.html
Presidium testers are a trusted name in electronic testing. These testers run off of 3 AAA batteries and come with a case. With a two year factory warranty you can rest assured that these quality products will give you a correct result each and every time. Looking for a high quality diamond or gemstone tester?
https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
Jul 27, 2021 · A simpler method for determining gold purity in jewelry is the “touchstone” testing process, an age-old technique that is relatively nondestructive to jewelry and offers quick results. Use with care: Touchstone testing incorporates the use of acids, so pay close attention to …
https://www.qima.com/testing/jewelry
QIMA offers extensive testing for jewelry made of various materials, from gemstones and precious metals, to non-precious metals and polymer materials. Our inspectors will test your products against relevant safety regulations and quality standards, checking their flammability, tension, corrosion resistance, and other performance characteristics.
https://www.totaram.com/education/cat/gold-jewelry/post/gold-purity-testing/
The method known as 'fire assay' is the oldest known method of testing gold and continues to be one of the most accurate. When gold is melted, a sample of the gold is taken, either by drilling through the poured bar or by capillary tube sampling while the gold is in a molten state. The sample is weighed very precisely and the weight recorded.
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