What does this means ka1772 Italy 925 or stands for?

Answer 1

Ka 1772:

Ka 1772 is a registered trademark used for Jewelry Made of Precious Metal and In the Form of Necklaces, Bracelets, etc and owned by KARIZIA s.r.l.

925:

925 means 925 hundredths of the metal, the other 75 are alloys or other metals.

As it pertains to sterling silver jewelry:

For instance, a sterling silver ring is often stamped 925. Sterling Silver 925 is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of other metals, typically copper. The sterling silver standard has a minimum fineness of 925.

Fine silver (99.9% pure) is often considered too soft for producing functional objects; therefore, the silver is usually alloyed with copper to give it strength, while at the same time preserving the ductility and beauty of the precious metal.

Citations:

See related link..