HCT is the maker of the jewelry
Early Swarovski Jewelry was marked SAL
peanut butter
Platinum
Company name.
900 is typical of a marking indicating 90% silver. Most silver jewelry is 925 meaning 92.5% pure. Not sure about the CE stamp.
"S26" is likely a marking that indicates the type of material used in the jewelry piece, such as sterling silver with a purity of 92.5%. It is a common marking on jewelry to signify the composition of the metal used.
"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.
ts
375 is the marking for 9 carat gold. Usually vintage European will have this marking.
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.