Silver Necklace

How to tell is my necklace is real silver?
I just bought a silver necklace it’s really heavy, and on the back it says ITALY 925 is it real or not?
it is real sterling silver. The 925 denotes that (92.5 % fine silver, the rest is copper to make it a bit harder).
Cheers
How to Design & Make Jewelry: Part 1 : Making A Silver Necklace by Hand: Part 1
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