375 is the marking for 9 carat gold. Usually vintage European will have this marking.
The 220 hallmark on jewelry means it is a commercial bronze alloy.
The "9ci" marking on jewelry likely refers to the metal purity of the piece. In this case, it likely means the jewelry is made of 9 carat gold, which is 37.5% pure gold. It's a common marking for gold jewelry in some countries.
The 833 marking on gold signifies that it is 833 parts pure out of 1000. Translated to karats this would be 20kt, a popular purity used in Portuguese jewelry.
14 Karat Heavy Gold Filled(plated).
The question i have is does Edco make any real jewelry?
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Platinum
"18kt" refers to the gold content of the jewelry, indicating that it is made with 75% gold. "ssss" is not a standard jewelry marking and may not have a specific meaning. It could be a manufacturer's mark, a designer's signature, or a custom engraving.
Gold jewelry in Portugual must by law be 19.2 karat pure, there fore the marking of 800 translates to 80% gold, or 19.2 parts out of 24 (24 parts being 24 karat gold, 100% pure). A lot of European gold jewelry is marked 750, which ranslates to 75% gold content, or 18K, 18 out of 24 parts gold. Gold in the US is typically 14K or 58.5% gold, which is represented by the mark 585, 417 is 10K, 41.7% gold. Hope this helps.
Early Swarovski Jewelry was marked SAL
10kt PPC on jewelry stands for 10 karat pure precious metal, indicating that the metal used is 10 karat gold. This marking signifies that the jewelry contains 41.7% gold and other metal alloys to make it more durable. It is a common standard for gold jewelry in the US.