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925 is the stamp for sterling silver.
I think you are talking about the inscription on the diamond...This is used so that if you ever give your jewelry to a jeweler you will be able to know for sure if he did not switch your diamond with a fake.
Earring stamp 925ehc diamond encircle by little diamond
What does CNA 925 STAMP MEAN INSIDE A RING?
The 925 stamp mean the jewelry made from 92.5 percent silver.
925 is typically the standing stamp on sterling silver jewelry so in this example this would mean the gold is plated on a sterling silver banding and set with diamonds.
FAS 925 on a gold ring what does it mean?
It means it's Sterling Silver (925), and the SUN is the stamp for the manufacturer
925 means it is sterling silver. 925/1000 parts silver. "Si" is probably the makers mark(initials)
If a piece of jewelry is stamped with OTC 925, the OTC stamp is the name of the company that made the jewelry, OTC International. 925 is a common stamp on all sterling silver.
925 is the stamp for sterling silver , the "wd" is more than likely the manufacturers initials
"925" usually indicates sterling silver.