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https://www.finishing.com/118/26.shtml
Jul 18, 2021 · As someone from the finishing industry, I don't personally understand this black marking from gold jewelry, nor whether or not it is related to iron levels or to makeup; your fellow jewelry wearers will have more to say about that than I can.
https://bergjewelers.com/pages/trade-marks-black-hills-gold-jewelry-manufacturers
Identifying Trademarks Black Hills Gold Jewelry Manufacturers It is required by law that all Black Hills Gold received a stamp of the Manufacture on every piece of Black Hills Gold. This stamp is very small, use a magnifying glass to best see the stamp.
https://www.yatesjewelers.com/why-does-my-gold-ring-turn-my-finger-black.html
The most common reason your finger gets discolored when wearing a gold ring is ‘metallic abrasion’. This is caused by makeup, or other cosmetics, on the skin. Cosmetics contain compounds that are harder than the gold (remember gold is soft). So the makeup will rub off very tiny particles of the metal.5/5(364)
https://www.leaf.tv/articles/how-to-clean-gold-jewelry-thats-turning-black/
Jewelry made of pure gold doesn't tarnish because it doesn't corrode or oxidize, but gold pieces made with an alloy such as copper or silver may tarnish and turn black. Gold jewelry can also darken when it's frequently exposed to soap, lotion and everyday grime.
https://healthfully.com/does-gold-turn-skin-black-4578623.html
Jul 28, 2017 · Jewelry made from 14-karat gold is as close to pure as functionally possible, though some decorative pieces not meant to be worn are even more pure. If gold in excess of 14 karats causes black or dark green marks on the skin, there is only one reason: an iron deficiency.
https://www.diamondreview.com/forum/topic/3864-black-spots-on-gold/
Jul 16, 2008 · I cleaned it in a liquid ring cleaner and it didn't come off. I'm not sure if a better cleaning solution and/or machine do a better job. The ring is 14ct. gold. Thanks. Looks like you need a rhodium coating. Takes 5 minutes, any jeweler can do it. Should cost about $10-15. Good luck to you you.
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