18K gold discoloration

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Can 18K gold discolor from being worn? I am talking about rings, watches and anything that would touch sweaty skin.
 
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Usually it’s the skin that is discoloured from sweat. ( usually the lower than 18k )

But gold does tarnish to a dark brown, usually not from constant use, more the opposite.
 
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Usually it’s the skin that is discoloured from sweat. ( usually the lower than 18k )

But gold does tarnish to a dark brown, usually not from constant use, more the opposite.
How come some golden watches have perfectly shiny backs while others are basically brown? Would it imply the brown ones are unworn?
 
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As above, 18ct gold is perfectly capable of developing a red/brown tarnish, but it takes a long time to build up and is removed by relatively modest polishing/wear. As a result, it’s generally found on areas not exposed to skin, as the very slight but frequent friction associated with skin contact is sufficient to prevent it from developing.

Same with vintage rings, unless sat unworn for decades in a box, you won’t see tarnish in the inside of a gold ring. But may see it in sheltered parts on the outside. Particularly in details areas where rubbing isn’t felt from day to day wear.
 
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Yes. It is more of a bloom than actual tarnish. It takes very little effort to remove it, a single pass with a polishing cloth is usually enough.

9K tarnishes, 18K blooms and 22K stays inviolate.
 
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Hm, I will try but I have to get my hands on 18K solid something first.

For now I have a 14K GF(you can see it in the Seiko forum where I posted pics). Would it improve its condition if I rub it with a cloth? It's pretty thick filling.
 
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I use Connoisseurs Dazzle Gel on my watches every 6 months or so...... quick jewelry cleaner + brush for diamonds, gemstones, gold, platinum & more.

Clean wearing cotton gloves, put back into watch case, avoid fingerprints so as not to get finger residue.

Works a treat