Argentium sterling silver, often marked A925, is a silver alloy composed of smelting 92.5% silver, 7.5% copper, and a pinch of germanium.
92 is 8925 a better piece of silver
What's A925
HCT is the maker of the jewelry
Early Swarovski Jewelry was marked SAL
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Platinum
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375 is the marking for 9 carat gold. Usually vintage European will have this marking.
The SC with an anchor symbol on jewelry stands for "Sterling Craft," which indicates the piece is made of sterling silver. Sterling silver has a high purity level of at least 92.5% silver, making it a valuable and durable material for jewelry.
The 220 hallmark on jewelry means it is a commercial bronze alloy.
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.
VCLM jewelry is vintage pieces of costume jewelry with a specific marking of "VCLM." They are created by the vintage jewelry company VCLM.
HMS is a company that specializes in 18k, 14k, 10k and platinum jewelry