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https://www.answers.com/Q/Does_20_microns_mean_it%27s_a_valuable_piece_of_jewelry
"20 microns" is a size measurement that has very little indeed to do with evaluating a piece of jewelry. More applicable would be someting like karat markings or carat weight.
https://quickjewelryrepairs.com/articles/gold-plating-jewelry-thickness/
Sep 16, 2019 · Micron plating, on the other hand, is where the measurement comes in. What’s a Micron? A micron is 0.001 of a millimeter. It’s a little hard to visualize, but basically any gold plating that’s 1 micron or up is good quality gold plating. As a comparison, flash plating is less than one micron- it’s actually under 0.175 micron.
https://community.ebay.com/t5/Archive-Watches-Clocks-and/What-is-Switzerland-20-Microns-Plaque-ORL/td-p/1987163
Nov 13, 2007 · "Plaque" = Plated, "OR" = Gold, so your piece is plated with 20 Microns of gold. Greg
https://www.stuller.com/articles/view/definition-of-plated-and-filled/
When a product is referred to as gold, rhodium, or nickel-plated, this indicates that it has been electroplated with a thin layer of that particular metal. An article of jewelry is Gold-Plated when gold is electroplated or mechanically sheathed with a minimum thickness of 1/2 …
https://www.indiamart.com/proddetail/micron-plating-7566182748.html
Micron is the internationally accepted measure of thickness. Under Micron Plating, Silver jewelry is plated with microns ranging from 2 to 5. More the microns, more thick the gold plating gets. This charming look of gold plating on silver makes the jewelry exceptionally appealing. The …
https://www.gldn.com/blogs/journal/gold-filled-vc-gold-plated-jewelry
Jun 10, 2020 · Industry standards mean you trust the quality. A 5% minimum of gold by weight is required for a piece to be called “gold-filled.” Well, plating has extremely vague legal requirements. It can be as thin as half a micron or thicker, and you have no real way of …
https://www.antique-jewelry-investor.com/can-something-solid-gold-also-have-a-stamp-that-reads-plaque-20-g-comments.html
Plaque 20 g stamped on the watch case, means the metal is not sold gold but plated with 20 microns of gold. You can find Cartier manual wind mechanical movement, watches, stamped "Cartier" "PLAQUE OR G 20 M" "Swiss" Omega also made (1970s) watches, that were marked on the side 20 (for 20 microns) with the Omega insignia inside a triangle.
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